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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2020	Jul. 22, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Trading Symbol	ACAD
Entity Registrant Name	ACADIA PHARMACEUTICALS INC.
Entity Central Index Key	0001070494
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		157,680,830
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	000-50768
Entity Tax Identification Number	06-1376651
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity Address, Address Line One	3611 Valley Centre Drive, Suite 300
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92130
City Area Code	858
Local Phone Number	558-2871
Entity Incorporation, State or Country Code	DE
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Security Exchange Name	NASDAQ

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 310,441	$ 189,680
Investment securities, available-for-sale	348,110	507,749
Accounts receivable, net	43,785	35,781
Interest and other receivables	2,343	2,093
Inventory	6,210	6,341
Prepaid expenses	24,846	18,606
Total current assets	735,735	760,250
Property and equipment, net	6,687	3,180
Operating lease right-of-use assets	7,880	9,524
Intangible assets, net	1,846	2,585
Restricted cash	5,770	4,787
Other assets	1,731	2,857
Total assets	759,649	783,183
Liabilities and stockholders’ equity
Accounts payable	6,466	7,222
Accrued liabilities	79,956	67,604
Total current liabilities	86,422	74,826
Operating lease liabilities	5,669	6,361
Other long-term liabilities	4,545	2,861
Total liabilities	96,636	84,048
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 5,000,000 shares authorized at June 30, 2020 and December 31, 2019; no shares issued and outstanding at June 30, 2020 and December 31, 2019
Common stock, $0.0001 par value; 225,000,000 shares authorized at June 30, 2020 and December 31, 2019; 157,383,379 shares and 155,275,300 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	15	15
Additional paid-in capital	2,495,804	2,402,945
Accumulated deficit	(1,834,286)	(1,704,122)
Accumulated other comprehensive income	1,480	297
Total stockholders’ equity	663,013	699,135
Total liabilities and stockholders’ equity	$ 759,649	$ 783,183

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	225,000,000	225,000,000
Common stock, shares issued	157,383,379	155,275,300
Common stock, shares outstanding	157,383,379	155,275,300

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Total revenues	$ 110,103	$ 83,205	$ 200,171	$ 146,164
Operating expenses
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of product sales	$ 2,899	$ 2,958	$ 5,698	$ 5,908
License fees and royalties	2,575	2,037	4,750	3,667
Research and development	64,295	67,320	136,931	120,243
Selling, general and administrative	84,344	67,981	186,317	161,071
Total operating expenses	154,113	140,296	333,696	290,889
Loss from operations	(44,010)	(57,091)	(133,525)	(144,725)
Interest income, net	1,825	2,527	4,814	5,461
Other income (expense)	437	(12)	(1,060)	(241)
Loss before income taxes	(41,748)	(54,576)	(129,771)	(139,505)
Income tax expense	393	365	393	740
Net loss	$ (42,141)	$ (54,941)	$ (130,164)	$ (140,245)
Net loss per common share, basic and diluted	$ (0.27)	$ (0.38)	$ (0.83)	$ (0.97)
Weighted average common shares outstanding, basic and diluted	156,535	144,314	155,951	144,148

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (42,141)	$ (54,941)	$ (130,164)	$ (140,245)
Other comprehensive income (loss):
Unrealized (loss) gain on investment securities	(43)	348	1,183	925
Foreign currency translation adjustments	(2)	(1)		1
Comprehensive loss	$ (42,186)	$ (54,594)	$ (128,981)	$ (139,319)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net loss	$ (130,164)	$ (140,245)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	41,855	40,305
Amortization of premiums and accretion of discounts on investment securities	481	(1,995)
Amortization of intangible assets	739	739
Loss on strategic investment	1,060	241
Depreciation	648	741
Changes in operating assets and liabilities:
Accounts receivable, net	(8,004)	(5,691)
Interest and other receivables	(250)	758
Inventory	(20)	273
Prepaid expenses	(6,240)	2,220
Operating lease right-of-use assets	2,025	1,133
Other assets	66	70
Accounts payable	(756)	1,483
Accrued liabilities	11,853	(1,576)
Operating lease liabilities	(862)	(1,077)
Long-term liabilities	1,684	49
Net cash used in operating activities	(85,885)	(102,572)
Cash flows from investing activities
Purchases of investment securities	(100,813)	(176,677)
Maturities of investment securities	261,153	210,904
Purchases of property and equipment	(3,867)	(842)
Net cash provided by investing activities	156,473	33,385
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	51,155	8,822
Net cash provided by financing activities	51,155	8,822
Effect of exchange rate changes on cash	1
Net increase (decrease) in cash, cash equivalents and restricted cash	121,744	(60,365)
Cash, cash equivalents and restricted cash
Beginning of period	194,467	139,584
End of period	316,211	79,219
Supplemental disclosure of noncash information:
Property and equipment purchases in accounts payable and accrued liabilities	$ 288	$ 17

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018	$ 479,079	$ 14	$ 1,948,300	$ (1,468,863)	$ (372)
Issuance of common stock from exercise of stock options and units			6,623
Issuance of common stock pursuant to employee stock purchase plan			2,199
Stock-based compensation			40,332
Net loss	(140,245)			(140,245)
Ending balance at Jun. 30, 2019	388,914	14	1,997,454	(1,609,108)	554
Other comprehensive (loss) income	926
Beginning balance at Mar. 31, 2019	418,356	14	1,972,302	(1,554,167)	207
Issuance of common stock from exercise of stock options and units			2,447
Issuance of common stock pursuant to employee stock purchase plan			2,199
Stock-based compensation			20,506
Net loss	(54,941)			(54,941)
Ending balance at Jun. 30, 2019	388,914	14	1,997,454	(1,609,108)	554
Other comprehensive (loss) income	347
Beginning balance at Dec. 31, 2019	699,135	15	2,402,945	(1,704,122)	297
Issuance of common stock from exercise of stock options and units			47,185
Issuance of common stock pursuant to employee stock purchase plan			3,970
Stock-based compensation			41,704
Net loss	(130,164)			(130,164)
Ending balance at Jun. 30, 2020	663,013	15	2,495,804	(1,834,286)	1,480
Other comprehensive (loss) income	1,183
Beginning balance at Mar. 31, 2020	638,382	15	2,428,987	(1,792,145)	1,525
Issuance of common stock from exercise of stock options and units			43,431
Issuance of common stock pursuant to employee stock purchase plan			3,970
Stock-based compensation			19,416
Net loss	(42,141)			(42,141)
Ending balance at Jun. 30, 2020	663,013	$ 15	$ 2,495,804	$ (1,834,286)	$ 1,480
Other comprehensive (loss) income	$ (45)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Organization and Business

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Organization and Business

1. Organization and Business

ACADIA Pharmaceuticals Inc. (the “Company”), based in San Diego, California, is a biopharmaceutical company focused on the development and commercialization of innovative medicines to address unmet medical needs in central nervous system disorders. The Company was originally incorporated in Vermont in 1993 as Receptor Technologies, Inc. and reincorporated in Delaware in 1997.

In April 2016, the U.S. Food and Drug Administration (“FDA”) approved the Company’s first drug, NUPLAZID^® (pimavanserin), for the treatment of hallucinations and delusions associated with Parkinson’s disease psychosis (“PD Psychosis”). NUPLAZID became available for prescription in the United States in May 2016.

Basis of Presentation and Significant Accounting Policies

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

2. Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of the Company should be read in conjunction with the audited financial statements and notes thereto as of and for the year ended December 31, 2019 included in the Company’s Annual Report on Form 10-K (“Annual Report”) filed with the Securities and Exchange Commission (the “SEC”). The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, since they are interim statements, the accompanying financial statements do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying financial statements reflect all adjustments (consisting of normal recurring adjustments) that are necessary for a fair statement of the financial position, results of operations, cash flows, and stockholders’ equity for the interim periods presented. Interim results are not necessarily indicative of results for a full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and the accompanying notes. Actual results could differ from those estimates.

Risk and Uncertainties

The global pandemic resulting from the disease known as COVID-19, caused by a novel strain of coronavirus, SARS-CoV-2, has caused national and global economic and financial market disruptions and has impacted the Company’s business, including by causing the vast majority of the Company’s workforce to work remotely since March 2020. Although the Company did not see a material impact on its net revenue in the first half of 2020 due to the COVID-19 pandemic, the Company cannot predict the duration or magnitude of the pandemic or the full impact that it may have on the Company’s financial condition, operations, suppliers, and workforce.

During the six months ended June 30, 2020, there have been no changes to the Company’s significant accounting policies as described in its Annual Report on Form 10-K for the fiscal year ended December 31, 2019, except as described below and in Note 6, investments.

Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the statement of cash flows that sum to the total of the same such amounts shown in the statement of cash flows (in thousands):

	Six Months Ended June 30, 2020				Six Months Ended June 30, 2019
	Beginning of period		End of period		Beginning of period		End of period
Cash and cash equivalents	$	189,680	$	310,441	$	134,758	$	74,432
Restricted cash		4,787		5,770		4,826		4,787
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	194,467	$	316,211	$	139,584	$	79,219

Accounts Receivable

Accounts receivable are recorded net of customer allowances for distribution fees, prompt payment discounts, chargebacks, and credit losses. Allowances for distribution fees, prompt payment discounts and chargebacks are based on contractual terms. As described further in Note 10, Recent Accounting Pronouncements, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Codification 326-20, Financial Instruments – Credit Losses (“ASC 326-20”) as of January 1, 2020. The Company estimated the current expected credit losses of its accounts receivable by assessing the risk of loss and available relevant information about the collectability, including historical credit losses, existing contractual payment terms, actual payment patterns of its customers, individual customer circumstances, and reasonable and supportable forecast of economic conditions expected to exist throughout the contractual life of the receivable. Based on its assessment, as of June 30, 2020 the Company determined that an allowance for credit loss was not required.

Although the Company has not historically experienced significant credit losses, the Company’s exposure may increase due to uncertainties associated with the global economic recession and other disruptions resulting from the COVID-19 pandemic.

License Fees and Royalties

The Company expenses amounts paid to acquire licenses associated with products under development when the ultimate recoverability of the amounts paid is uncertain and the technology has no alternative future use when acquired. Acquisitions of technology licenses are charged to expense or capitalized based upon management’s assessment regarding the ultimate recoverability of the amounts paid and the potential for alternative future use. The Company has determined that technological feasibility for its product candidates is reached when the requisite regulatory approvals are obtained to make the product available for sale.

In connection with the FDA approval of NUPLAZID in April 2016, the Company made a one-time milestone payment of $8.0 million pursuant to its 2006 license agreement with the Ipsen Group in which the Company licensed certain intellectual property rights that complement its patent portfolio for its serotonin platform, including NUPLAZID. The Company capitalized the $8.0 million payment as an intangible asset and is amortizing the asset on a straight-line basis over the estimated useful life of the licensed patents through the second half of 2021. The Company recorded amortization expense related to its intangible asset of $0.4 million and $0.7 million for each of the three and six months ended June 30, 2020 and 2019, respectively. As of June 30, 2020, estimated future amortization expense related to the Company’s intangible asset was $0.7 million for the remainder of 2020 and $1.1 million for 2021.

Royalties incurred in connection with the Company’s license agreement with the Ipsen Group, as disclosed in Note 9, Commitments and Contingencies, are expensed to license fees and royalties as revenue from product sales is recognized.

Net Loss Per Share

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Net Loss Per Share

3. Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted average number of common shares outstanding for the period, without consideration for common stock equivalents. Diluted net loss per share is computed by dividing the net loss by the weighted average number of common shares and common stock equivalents outstanding for the period determined using the treasury stock method. For purposes of this calculation, stock options, employee stock purchase plan rights, restricted stock units, and warrants are considered to be common stock equivalents but are not included in the calculations of diluted net loss per share for the periods presented as their effect would be anti-dilutive. The Company incurred net losses for all periods presented and there were no reconciling items for potentially dilutive securities. More specifically, at June 30, 2020 and 2019, stock options, employee stock purchase plan rights, restricted stock units, and warrants totaling approximately 19,930,000 shares and 23,389,000 shares, respectively, were excluded from the calculation of diluted net loss per share as their effect would have been anti-dilutive.

Stock-Based Compensation

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

4. Stock-Based Compensation

The following table summarizes the total stock-based compensation expense included in the Company’s condensed consolidated statements of operations for the periods presented (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of product sales	$	743	$	803	$	1,592	$	1,798
Research and development		7,235		7,901		15,692		15,781
Selling, general and administrative		11,529		11,718		24,571		22,726
	$	19,507	$	20,422	$	41,855	$	40,305

Balance Sheet Details

6 Months Ended

Jun. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Balance Sheet Details

5. Balance Sheet Details

Inventory consisted of the following (in thousands):

	June 30, 2020		December 31, 2019
Raw material	$	2,677	$	3,175
Work in process		1,173		1,685
Finished goods		2,360		1,481
	$	6,210	$	6,341

Accrued liabilities consisted of the following (in thousands):

	June 30, 2020		December 31, 2019
Accrued compensation and benefits	$	20,005	$	21,080
Accrued consulting and professional fees		19,611		13,691
Accrued research and development services		19,355		14,273
Accrued sales allowances		12,884		11,326
Current portion of lease liabilities		2,653		3,434
Accrued royalties		2,214		1,971
Other		3,234		1,829
	$	79,956	$	67,604

Investments

6 Months Ended

Jun. 30, 2020

Investments Debt And Equity Securities [Abstract]

Investments

6. Investments

The carrying value and amortized cost of the Company’s investments, summarized by major security type, consisted of the following (in thousands):

	June 30, 2020
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
U.S. Treasury notes	$	185,739	$	656	$	—		$	186,395
Government sponsored enterprise securities		38,445		111		—			38,556
Corporate debt securities		90,142		567		(1	)		90,708
Commercial paper		32,317		134		—			32,451
	$	346,643	$	1,468	$	(1	)	$	348,110

	December 31, 2019
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
U.S. Treasury notes	$	228,609	$	7	$	(13	)	$	228,603
Government sponsored enterprise securities		88,920		5		(30	)		88,895
Corporate debt securities		87,785		262		(8	)		88,039
Commercial paper		102,151		61		—			102,212
	$	507,465	$	335	$	(51	)	$	507,749

The Company has classified all of its available-for-sale investment securities, including those with maturities beyond one year, as current assets on its condensed consolidated balance sheets based on the highly liquid nature of the investment securities and because these investment securities are considered available for use in current operations. As of June 30, 2020, all of the Company’s available-for-sale investment securities have contractual maturity dates of less than one year. As of December 31, 2019, the Company held $24.3 million of available-for-sale investment securities with contractual maturity dates of more than one year and less than two years. The Company has classified all equity securities as other assets on its condensed consolidated balance sheets.

At June 30, 2020 and December 31, 2019, the Company had one and 20 available-for-sale investment securities, respectively, in an unrealized loss position. The following table presents gross unrealized losses and fair value for those available-for-sale investment securities that were in an unrealized loss position as of June 30, 2020 and December 31, 2019, aggregated by investment category and length of time that the individual securities have been in a continuous loss position (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
June 30, 2020
Corporate debt securities	$	—	$	—		$	4,003	$	(1	)	$	4,003	$	(1	)
Total	$	—	$	—		$	4,003	$	(1	)	$	4,003	$	(1	)

	Less Than 12 Months					12 Months or Greater					Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
December 31, 2019:
U.S. Treasury notes	$	148,397	$	(13	)	$	—	$	—		$	148,397	$	(13	)
Government sponsored enterprise securities		61,103		(30	)		—		—			61,103		(30	)
Corporate debt securities		11,334		(8	)		—		—			11,334		(8	)
Total	$	220,834	$	(51	)	$	—	$	—		$	220,834	$	(51	)

As described further in Note 10, Recent Accounting Pronouncements the Company adopted FASB Accounting Standards Codification 326-30, Financial Instruments – Credit Losses (“ASC 326-30”) as of January 1, 2020. ASC 326-30 requires the Company to determine whether a decline in the fair value below the amortized cost basis of available-for-sale securities is due to credit-related factors. At each reporting date, the Company performs an evaluation of impairment to determine if any unrealized losses are the result of credit losses. Impairment is assessed at the individual security level. Factors considered in determining whether a loss resulted from a credit loss or other factors include the Company’s intent and ability to hold the investment until the recovery of its amortized cost basis, the extent to which the fair value is less than the amortized cost basis, the length of time and extent to which fair value has been less than the cost basis, the financial condition of the issuer, any historical failure of the issuer to make scheduled interest or principal payments, any changes to the rating of the security by a rating agency, any adverse legal or regulatory events affecting the issuer or issuer’s industry, any significant deterioration in economic conditions.

The Company does not intend to sell the investment in unrealized loss position and it is unlikely that the Company will be required to sell the investment before the recovery of its amortized cost basis. Based on its evaluation, the Company determined its year-to-date credit losses related to its available-for-sale securities were immaterial at June 30, 2020.

Although the Company has not historically experienced significant losses on its investments, the Company’s exposure may increase due to uncertainties associated with the global economic recession and other disruptions resulting from the COVID-19 pandemic.

Fair Value Measurements

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

7. Fair Value Measurements

The Company’s investments include cash equivalents, available-for-sale investment securities consisting of money market funds, U.S. Treasury notes, and high quality, marketable debt instruments of corporations and government sponsored enterprises in accordance with the Company’s investment policy, and equity securities. The Company’s investment policy defines allowable investment securities and establishes guidelines relating to credit quality, diversification, and maturities of its investments to preserve principal and maintain liquidity. All investment securities have a credit rating of at least A3/A- or better, or P-1/A-1 or better, as determined by Moody’s Investors Service or Standard & Poor’s.

The Company’s cash equivalents, available-for-sale investment securities and equity securities are classified within the fair value hierarchy as defined by authoritative guidance. The Company’s investment securities and equity securities classified as Level 1 are valued using quoted market prices. The Company obtains the fair value of its Level 2 financial instruments from third-party pricing services. The pricing services utilize industry standard valuation models whereby all significant inputs, including benchmark yields, reported trades, broker/dealer quotes, issuer spreads, bids, offers, or other market-related data, are observable. The Company validates the prices provided by the third-party pricing services by reviewing their pricing methods and matrices, and obtaining market values from other pricing sources. After completing the validation procedures, the Company did not adjust or override any fair value measurements provided by these pricing services as of June 30, 2020 and December 31, 2019.

The Company does not hold any securities classified as Level 3, which are securities valued using unobservable inputs. The Company has not transferred any investment securities between the classification levels.

The recurring fair value measurements of the Company’s cash equivalents, available-for-sale investment securities and equity securities at June 30, 2020 and December 31, 2019 consisted of the following (in thousands):

			Fair Value Measurements at Reporting Date Using
	June 30, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market fund	$	282,247	$	282,247	$	—	$	—
U.S. Treasury notes		186,395		186,395		—		—
Equity securities		1,247		1,247		—		—
Government sponsored enterprise securities		38,556		—		38,556		—
Corporate debt securities		90,708		—		90,708		—
Commercial paper		32,451		—		32,451		—
	$	631,604	$	469,889	$	161,715	$	—

			Fair Value Measurements at Reporting Date Using
	December 31, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market fund	$	98,084	$	98,084	$	—	$	—
U.S. Treasury notes		228,603		228,603		—		—
Equity securities		2,307		2,307		—		—
Government sponsored enterprise securities		103,878		—		103,878		—
Corporate debt securities		88,039		—		88,039		—
Commercial paper		102,212		—		102,212		—
	$	623,123	$	328,994	$	294,129	$	—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Stockholders' Equity

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Stockholders' Equity

8. Stockholders’ Equity

Public Offerings

In September 2019, the Company raised net proceeds of approximately $271.5 million from the sale of 7,187,500 shares of its common stock in a follow-on public offering, including 937,500 shares sold pursuant to the exercise in full of the underwriters’ option to purchase additional shares.

In November 2018, the Company raised net proceeds of approximately $298.5 million from the sale of 18,602,941 shares of its common stock in a follow-on public offering, including 2,426,470 shares sold pursuant to the exercise in full of the underwriters’ option to purchase additional shares.

In August 2016, the Company raised net proceeds of approximately $215.9 million from the sale of 6,969,696 shares of its common stock in a follow-on public offering, including 909,090 shares sold pursuant to the exercise in full of the underwriters’ option to purchase additional shares.

In January 2016, the Company raised net proceeds of approximately $281.6 million from the sale of 10,344,827 shares of its common stock in a follow-on public offering. In connection with the January 2016 offering, the Company entered into a registration rights agreement (the “Registration Rights Agreement”) with 667, L.P., Baker Brothers Life Sciences, L.P. and 14159, L.P. (the “Baker Entities”), all of which are existing stockholders of the Company and are affiliated with two of its directors, Julian C. Baker and Dr. Stephen R. Biggar. Under the Registration Rights Agreement, the Company agreed that, if the Baker Entities demand that the Company register their shares of its common stock for resale under the Securities Act of 1933, as amended (the “Securities Act”), the Company would be obligated to effect such registration. The Company’s registration obligations under the Registration Rights Agreement cover all shares of its common stock now held or later acquired by the Baker Entities (including approximately $75.0 million, $43.0 million, $200.0 million, and $62.5 million of shares that the Baker Entities purchased at the public offering price in the January 2016, August 2016, November 2018, and September 2019 offerings, respectively), will continue in effect for up to 10 years, and include the Company’s obligation to facilitate certain underwritten public offerings of its common stock by the Baker Entities in the future. The Company has agreed to bear all expenses incurred by it in effecting any registration pursuant to the Registration Rights Agreement as well as the legal expenses of the Baker Entities of up to $50,000 per underwritten public offering effected pursuant to the Registration Rights Agreement. On May 3, 2019, pursuant to the Registration Rights Agreement, the Company filed a registration statement covering all shares owned by the Baker Entities as of April 29, 2019.

Private Equity Financings

In December 2012, the Company raised net proceeds of $80.5 million through the sale of 19,000,000 shares of its common stock at a price of $4.43 per share and the sale of warrants to purchase 500,000 shares of its common stock at a price of $4.42 per warrant share in a private equity financing. The warrants have an exercise price of $0.01 per share. In accordance with authoritative accounting guidance, the warrants’ value of $2.2 million was determined on the date of grant using the Black-Scholes model and recorded as a component of stockholders’ equity within additional paid-in capital. Per their terms, the warrants to purchase 500,000 shares of common stock, of which 493,145 remained outstanding at June 30, 2020, may not be exercised if the holder’s ownership of the Company’s common stock would exceed 19.99 percent following such exercise.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

9. Commitments and Contingencies

Royalty Payments

Pursuant to the terms of its 2006 license agreement with the Ipsen Group, the Company is required to make royalty payments of two percent of net sales of NUPLAZID. This obligation terminates in 2021.

License Agreements

The Company has entered into various collaboration and licensing agreements which provide the Company with rights to certain know-how, technology and patent rights. The agreements generally include upfront license fees, development and commercial milestone payments upon achievement of certain clinical and commercial development and annual net sales milestones, as well as royalties calculated as a percentage of product revenues, with rates that vary by agreement. As of June 30, 2020, the Company may be required to make milestone payments up to $1.1 billion.

In May 2018, the Company signed an Exclusivity Deed (the “Deed”) with Neuren Pharmaceuticals Limited (“Neuren”) that provided for exclusive negotiations for a period of three months from the date of the Deed. Under the terms of the Deed, the Company paid $3.1 million to purchase 1,330,000 shares of Neuren and paid $0.9 million for the exclusive right to negotiate a deal with Neuren, which was recorded in selling, general and administrative expenses in the second quarter of 2018. At June 30, 2020, the Company continues to hold the equity securities as a strategic investment in which the Company does not have a controlling interest or significant influence. Publicly held equity securities are measured using quoted prices in their respective active markets with changes recorded through other expense on the condensed consolidated statements of operations. Net gain on strategic investments recognized in other expense in the condensed consolidated statements of operations was $0.4 million for the three months ended June 30, 2020. Net loss on strategic investments recognized in other expense in the condensed consolidated statements of operations was $12,000 for the three months ended June 30, 2019, and $1.1 million and $0.2 million for the six months ended June 30, 2020 and 2019, respectively. The aggregate carrying amount of the Company’s strategic equity investment was $1.2 million and $2.3 million included in other assets on its condensed consolidated balance sheets at June 30, 2020 and December 31, 2019, respectively.

In August 2018, the Company entered into a license agreement with Neuren and obtained exclusive North American rights to develop and commercialize trofinetide for Rett syndrome and other indications. Under the terms of the agreement, the Company paid Neuren an upfront license fee of $10.0 million and it may be required to pay up to an additional $455.0 million in milestone payments based on the achievement of certain development and annual net sales milestones. In addition, the Company may be required to pay Neuren tiered, escalating, double-digit percentage royalties based on net sales. The license agreement was accounted for as an asset acquisition and the upfront cash payment of $10.0 million was expensed to research and development in the third quarter of 2018 as there is no alternative use for the asset.

In March 2020, the Company entered into a license agreement and research collaboration with Vanderbilt University and obtained exclusive worldwide rights to develop and commercialize novel drug candidates targeting positive allosteric modulators of the muscarinic M1 receptor (the M1 PAM program) with the potential to treat a range of central nervous system disorders. Under the terms of the agreement, the Company paid Vanderbilt University an upfront license fee of $10.0 million and may be required to pay up to $515.0 million in milestone payments based on the achievement of certain clinical and commercial development and annual net sales milestones. In addition, the Company may be required to pay Vanderbilt University tiered royalties based on net sales. Furthermore, the Company is required to spend a minimum annual amount in development and the pursuit of regulatory approval for the M1 PAM compounds over the first three years of the license agreement. Such amounts are not material to the Company. The license agreement was accounted for as an asset acquisition and the upfront cash payment of $10.0 million was expensed to research and development in the first quarter of 2020 as there is no future alternative use for the assets.

Corporate Credit Card Program

In connection with the Company’s credit card program, the Company established a letter of credit for $2.0 million, which has automatic annual extensions and is fully secured by restricted cash.

Fleet Program

In connection with the Company’s fleet program, the Company established a letter of credit for $0.4 million, which has automatic annual extensions and is fully secured by restricted cash.

Legal Proceedings

Between July 19 and August 3, 2018, following negative publicity about NUPLAZID, three purported company stockholders filed putative securities class action complaints (captioned Staublein v. ACADIA Pharmaceuticals, Inc., Case No. 18-cv-01647, Stone v. ACADIA Pharmaceuticals Inc., Case No. 18-cv-01672, and Barglow v. ACADIA Pharmaceuticals Inc., Case No. 18-cv-01812) in the U.S. District Court for the Southern District of California against the Company and certain of its current and former executive officers. Thereafter, several putative lead plaintiffs filed motions to consolidate the cases and to appoint a lead plaintiff. On January 3, 2019, the Court consolidated the cases under the caption In re ACADIA Pharmaceuticals Inc. Securities Litigation, Case No. 18-cv-01647, and took the lead plaintiff motions under submission. On February 26, 2019, the Court appointed a lead plaintiff and lead counsel. Lead plaintiff filed a consolidated complaint on April 15, 2019. The consolidated complaint generally alleges that defendants violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 by making materially false and misleading statements regarding the Company’s business, operations, and prospects by failing to disclose that adverse events and safety concerns regarding NUPLAZID threatened initial and continuing FDA approval, and by failing to disclose that the Company engaged in business practices likely to attract regulatory scrutiny. The consolidated complaint seeks unspecified monetary damages and other relief. Defendants filed a motion to dismiss the consolidated complaint on June 7, 2019. On June 1, 2020, the Court granted the motion in part and gave lead plaintiff leave to file an amended complaint. On July 16, 2020, lead plaintiff filed the amended complaint.

On February 7, 2020, a purported company stockholder filed a derivative complaint (captioned Barney v. Davis et al., Case No. 20-cv-0238) in the U.S. District Court for the Southern District of California against the Company’s directors and certain of its current and former executive officers. The complaint asserts claims for breach of fiduciary duty, waste of corporate assets, and unjust enrichment arising from allegations similar to those in the federal securities class action described above. On February 19, 2020, the Court granted the parties’ stipulation to stay the derivative action pending a ruling on the motion to dismiss in the federal securities class action. On July 16, 2020, the parties filed a joint motion to continue to stay the derivative action until the defendants answer, or the case is dismissed with prejudice and all appeals are exhausted, or any party gives 15 days’ written notice that it no longer consents to the voluntary stay. The Court stayed the action on July 22, 2020.

On June 23, 2020, a purported company stockholder filed a derivative complaint (captioned Lazarus v. Davis et al., Case No. 20-cv-0843) in the U.S. District Court for the District of Delaware against the Company’s directors and certain of its current and former executive officers. The complaint asserts claims for contribution, breach of fiduciary duty, waste of corporate assets, and unjust enrichment arising from allegations similar to those in the federal securities class action described above.

On July 24, 2020, the Company filed complaints against (i) Aurobindo Pharma Limited and its affiliate Aurobindo Pharma USA, Inc. and (ii) Teva Pharmaceuticals USA, Inc. and its affiliate Teva Pharmaceutical Industries Ltd., and on July 30, 2020, the Company filed complaints against (i) Hetero Labs Limited and its affiliates Hetero Labs Limited Unit-V and Hetero USA Inc., (ii) MSN Laboratories Private Ltd. and its affiliate MSN Pharmaceuticals, Inc., and (iii) Zydus Pharmaceuticals (USA) Inc. and its affiliate Cadila Healthcare Limited. These complaints, which were filed in the United States District Court for the District of Delaware, allege infringement of certain of the Company’s Orange Book-listed patents covering NUPLAZID.

Management currently believes that none of the foregoing claims or actions pending against the Company as of June 30, 2020 is likely to have, individually or in the aggregate, a material adverse effect on the Company’s business, liquidity, financial position, or results of operations. Given the unpredictability inherent in litigation, however, the Company cannot predict the outcome of these matters. The Company is unable to estimate possible losses or ranges of losses that may result from these matters, and therefore it has not accrued any amounts in connection with these matters other than attorneys’ fees incurred to date.

Government Investigation

In September 2018, the Company received a civil investigative demand (“CID”) from the Department of Justice (“DOJ”) requesting certain documents and information related to the Company’s sales and marketing of NUPLAZID. The Company is cooperating with the DOJ’s request. Responding to the CID will require considerable resources and no assurance can be given as to the timing or outcome of the DOJ’s investigation.

Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2020

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

Recent Accounting Pronouncements

10. Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments, which changes the impairment model for most financial assets and certain other instruments. For trade receivables and other instruments, entities will be required to use a new forward-looking expected loss model that generally will result in the earlier recognition of allowances for losses. For available-for-sale debt securities with unrealized losses, the losses will be recognized as allowances rather than as reductions in the amortized cost of the securities. This guidance is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those years, with early adoption permitted only as of annual reporting periods beginning after December 15, 2018.

In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, which, among other things, provides entities with practical expedients and policy elections related to the presentation and disclosure of accrued interest and the related allowance for credit losses and clarifies how to disclose line-of-credit arrangements that are converted to term loans in the vintage table disclosure. ASU 2019-04 has the same effective date as the new credit impairment standard for entities that have not yet adopted the standard. For entities that early adopted the new credit impairment standard, ASU 2019-04 is effective for fiscal years beginning after December 15, 2019 and interim periods therein. Entities that early adopted the new credit impairment standard may early adopt ASU 2019-04.

The Company adopted the above standards on January 1, 2020. The adoption of the new standards did not have a material impact on the Company’s consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12 Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes. The Board issued this Update as part of its Simplification Initiative to improve areas of GAAP and reduce cost and complexity while maintaining usefulness. The main provision that impacts the Company is the removal of the exception to the incremental approach of intra-period tax allocation when there is a loss from continuing operations and income or gain from other items (for example, discontinued operations and other comprehensive income). ASU 2019-12 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2020. Early adoption is permitted, including adoption in an interim period. The Company has elected to early adopt ASU 2019-12 as of the beginning of 2020, however, there is no cumulative effect to be recognized with the early adoption and no material impact on the Company’s consolidated financial statements.

Leases

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Leases

11. Leases

The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 1.5 year to 5.6 years, one of which includes an option to extend the lease for one five-year term. This optional period was not considered in the determination of the right-of-use asset or the lease liability as the Company did not consider it reasonably certain that it would exercise such option.

The operating lease costs were as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Operating lease cost	$	1,428	$	1,271	$	2,915	$	2,546

Supplemental cash flow information related to the Company’s leases were as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,291	$	1,228	$	2,582	$	2,357
Right-of-use assets obtained in exchange for operating lease obligations:		105		200		381		11,951

The balance sheet classification of the Company’s lease liabilities was as follows (in thousands):

	June 30, 2020		December 31, 2019
Operating lease liabilities
Current portion included in accrued liabilities	$	2,653	$	3,434
Operating lease liabilities		5,669		6,361
Total operating lease liabilities	$	8,322	$	9,795

Maturities of lease liabilities were as follows (in thousands):

	Operating Leases
Remainder of 2020	$	1,390
Years ending December 31,
2021		2,735
2022		2,210
2023		1,369
2024		1,114
Thereafter		1,011
Total lease payments		9,829
Less:
Imputed interest		(1,507	)
Total operating lease liabilities	$	8,322

Operating lease liabilities are based on the net present value of the remaining lease payments over the remaining lease term. In determining the present value of lease payments, the Company uses its incremental borrowing rate based on the information available at the lease commencement date. As of June 30, 2020, the weighted average remaining lease term is 4.8 years and the weighted average discount rate used to determine the operating lease liability was 8.0%.

In the fourth quarter of 2018, the Company entered into an agreement to lease approximately 67,020 square feet of corporate office space in San Diego, California with total minimum lease payments of $50.4 million over an initial term of 10 years and 9 months. In February 2020, the Company entered into the first amendment to the lease agreement to lease approximately 30,608 square feet of additional corporate office space in San Diego, California with total minimum lease payments of $25.3 million over an initial term of approximately 10 years and 7 months. In March 2020, the Company entered into the second amendment to the lease agreement which increased the total minimum lease payments of the original 67,020 square feet of corporate office space to $51.4 million. As of June 30, 2020, the lease had not yet commenced. This operating lease is expected to commence in the third quarter of 2020. In connection with this lease and its amendment agreements, the Company established a letter of credit for $3.1 million, which has automatic annual extensions and is fully secured by restricted cash.

Basis of Presentation and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Basis of Presentation

Risk and Uncertainties

Cash, Cash Equivalents and Restricted Cash

	Six Months Ended June 30, 2020				Six Months Ended June 30, 2019
	Beginning of period		End of period		Beginning of period		End of period
Cash and cash equivalents	$	189,680	$	310,441	$	134,758	$	74,432
Restricted cash		4,787		5,770		4,826		4,787
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	194,467	$	316,211	$	139,584	$	79,219

Accounts Receivable

License Fees and Royalties

Recent Accounting Pronouncements

The Company adopted the above standards on January 1, 2020. The adoption of the new standards did not have a material impact on the Company’s consolidated financial statements.

Basis of Presentation and Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

	Six Months Ended June 30, 2020				Six Months Ended June 30, 2019
	Beginning of period		End of period		Beginning of period		End of period
Cash and cash equivalents	$	189,680	$	310,441	$	134,758	$	74,432
Restricted cash		4,787		5,770		4,826		4,787
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	194,467	$	316,211	$	139,584	$	79,219

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-based Compensation Expense Included in Statements of Operations

The following table summarizes the total stock-based compensation expense included in the Company’s condensed consolidated statements of operations for the periods presented (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of product sales	$	743	$	803	$	1,592	$	1,798
Research and development		7,235		7,901		15,692		15,781
Selling, general and administrative		11,529		11,718		24,571		22,726
	$	19,507	$	20,422	$	41,855	$	40,305

Balance Sheet Details (Tables)

6 Months Ended

Jun. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Inventory

Inventory consisted of the following (in thousands):

	June 30, 2020		December 31, 2019
Raw material	$	2,677	$	3,175
Work in process		1,173		1,685
Finished goods		2,360		1,481
	$	6,210	$	6,341

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	June 30, 2020		December 31, 2019
Accrued compensation and benefits	$	20,005	$	21,080
Accrued consulting and professional fees		19,611		13,691
Accrued research and development services		19,355		14,273
Accrued sales allowances		12,884		11,326
Current portion of lease liabilities		2,653		3,434
Accrued royalties		2,214		1,971
Other		3,234		1,829
	$	79,956	$	67,604

Investments (Tables)

6 Months Ended

Jun. 30, 2020

Investments Debt And Equity Securities [Abstract]

Carrying Value and Amortized Cost of Company Investments Summarized by Major Security Type

The carrying value and amortized cost of the Company’s investments, summarized by major security type, consisted of the following (in thousands):

	June 30, 2020
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
U.S. Treasury notes	$	185,739	$	656	$	—		$	186,395
Government sponsored enterprise securities		38,445		111		—			38,556
Corporate debt securities		90,142		567		(1	)		90,708
Commercial paper		32,317		134		—			32,451
	$	346,643	$	1,468	$	(1	)	$	348,110

	December 31, 2019
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
U.S. Treasury notes	$	228,609	$	7	$	(13	)	$	228,603
Government sponsored enterprise securities		88,920		5		(30	)		88,895
Corporate debt securities		87,785		262		(8	)		88,039
Commercial paper		102,151		61		—			102,212
	$	507,465	$	335	$	(51	)	$	507,749

Summary of Gross Unrealized Losses and Fair Value of Available-For-Sale Investment Securities in Unrealized Loss Position

The following table presents gross unrealized losses and fair value for those available-for-sale investment securities that were in an unrealized loss position as of June 30, 2020 and December 31, 2019, aggregated by investment category and length of time that the individual securities have been in a continuous loss position (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
June 30, 2020
Corporate debt securities	$	—	$	—		$	4,003	$	(1	)	$	4,003	$	(1	)
Total	$	—	$	—		$	4,003	$	(1	)	$	4,003	$	(1	)

	Less Than 12 Months					12 Months or Greater					Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses
December 31, 2019:
U.S. Treasury notes	$	148,397	$	(13	)	$	—	$	—		$	148,397	$	(13	)
Government sponsored enterprise securities		61,103		(30	)		—		—			61,103		(30	)
Corporate debt securities		11,334		(8	)		—		—			11,334		(8	)
Total	$	220,834	$	(51	)	$	—	$	—		$	220,834	$	(51	)

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements of Cash Equivalents, Available-For-Sale Investment Securities and Equity Securities

			Fair Value Measurements at Reporting Date Using
	June 30, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market fund	$	282,247	$	282,247	$	—	$	—
U.S. Treasury notes		186,395		186,395		—		—
Equity securities		1,247		1,247		—		—
Government sponsored enterprise securities		38,556		—		38,556		—
Corporate debt securities		90,708		—		90,708		—
Commercial paper		32,451		—		32,451		—
	$	631,604	$	469,889	$	161,715	$	—

			Fair Value Measurements at Reporting Date Using
	December 31, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market fund	$	98,084	$	98,084	$	—	$	—
U.S. Treasury notes		228,603		228,603		—		—
Equity securities		2,307		2,307		—		—
Government sponsored enterprise securities		103,878		—		103,878		—
Corporate debt securities		88,039		—		88,039		—
Commercial paper		102,212		—		102,212		—
	$	623,123	$	328,994	$	294,129	$	—

Leases (Tables)

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Summary of Operating Lease Costs

The operating lease costs were as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Operating lease cost	$	1,428	$	1,271	$	2,915	$	2,546

Supplemental Cash Flow Information Related to the Company's Leases

Supplemental cash flow information related to the Company’s leases were as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,291	$	1,228	$	2,582	$	2,357
Right-of-use assets obtained in exchange for operating lease obligations:		105		200		381		11,951

Summary of Balance Sheet Classification of Lease Liabilities

The balance sheet classification of the Company’s lease liabilities was as follows (in thousands):

	June 30, 2020		December 31, 2019
Operating lease liabilities
Current portion included in accrued liabilities	$	2,653	$	3,434
Operating lease liabilities		5,669		6,361
Total operating lease liabilities	$	8,322	$	9,795

Summary of Maturities of Lease Liabilities

Maturities of lease liabilities were as follows (in thousands):

	Operating Leases
Remainder of 2020	$	1,390
Years ending December 31,
2021		2,735
2022		2,210
2023		1,369
2024		1,114
Thereafter		1,011
Total lease payments		9,829
Less:
Imputed interest		(1,507	)
Total operating lease liabilities	$	8,322

Basis of Presentation and Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract]
Cash and cash equivalents	$ 310,441	$ 189,680	$ 74,432	$ 134,758
Restricted cash	5,770	4,787	4,787	4,826
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 316,211	$ 194,467	$ 79,219	$ 139,584

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group	$ 8,000
Finite-lived intangible assets, net	$ 8,000
Amortization of intangible assets		$ 400	$ 400	$ 739	$ 739
Estimated future amortization expense, remainder of 2020		700		700
Estimated future amortization expense, 2021		$ 1,100		$ 1,100

Net Loss Per Share - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Antidilutive securities to purchase common stock	19,930,000	23,389,000

Stock-Based Compensation - Summary of Stock-based Compensation Expense Included in Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 19,507	$ 20,422	$ 41,855	$ 40,305
Cost of product sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	743	803	1,592	1,798
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	7,235	7,901	15,692	15,781
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 11,529	$ 11,718	$ 24,571	$ 22,726

Balance Sheet Details - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw material	$ 2,677	$ 3,175
Work in process	1,173	1,685
Finished goods	2,360	1,481
Inventory	$ 6,210	$ 6,341

Balance Sheet Details - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accrued compensation and benefits	$ 20,005	$ 21,080
Accrued consulting and professional fees	19,611	13,691
Accrued research and development services	19,355	14,273
Accrued sales allowances	12,884	11,326
Current portion of lease liabilities	2,653	3,434
Accrued royalties	2,214	1,971
Other	3,234	1,829
Accrued liabilities	$ 79,956	$ 67,604

Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 348,110	$ 507,749
Equity securities, Amortized Cost	346,643
Equity securities, Unrealized Gains	1,468
Equity securities, Unrealized Losses	(1)
Equity securities, Estimated Fair Value	348,110
Debt and equity securities, Amortized Cost	346,643	507,465
Debt and equity securities, Unrealized Gains	1,468	335
Debt and equity securities, Unrealized Losses	(1)	(51)
Debt and equity securities, Estimated Fair Value	348,110	507,749
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	185,739	228,609
Debt securities, Unrealized Gains	656	7
Debt securities, Unrealized Losses		(13)
Debt securities, Estimated Fair Value	186,395	228,603
Equity securities, Amortized Cost		228,609
Equity securities, Unrealized Gains		7
Equity securities, Unrealized Losses		(13)
Equity securities, Estimated Fair Value		228,603
US Government Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	38,445	88,920
Debt securities, Unrealized Gains	111	5
Debt securities, Unrealized Losses		(30)
Debt securities, Estimated Fair Value	38,556	88,895
Equity securities, Amortized Cost		88,920
Equity securities, Unrealized Gains		5
Equity securities, Unrealized Losses		(30)
Equity securities, Estimated Fair Value		88,895
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	90,142	87,785
Debt securities, Unrealized Gains	567	262
Debt securities, Unrealized Losses	(1)	(8)
Debt securities, Estimated Fair Value	90,708	88,039
Equity securities, Amortized Cost		87,785
Equity securities, Unrealized Gains		262
Equity securities, Unrealized Losses		(8)
Equity securities, Estimated Fair Value		88,039
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	32,317	102,151
Debt securities, Unrealized Gains	134	61
Debt securities, Estimated Fair Value	$ 32,451	102,212
Equity securities, Amortized Cost		102,151
Equity securities, Unrealized Gains		61
Equity securities, Estimated Fair Value		$ 102,212

Investments - Additional Information (Detail) $ in Millions	6 Months Ended
Investments - Additional Information (Detail) $ in Millions	Jun. 30, 2020 Security	Dec. 31, 2019 USD ($) Security
Investments Debt And Equity Securities [Abstract]
Available-for-sale, investment securities held with maturity dates of more than one year and less than two years \| $		$ 24.3
Available-for-sale investment securities contractual maturity dates	less than one year
Number of available-for-sale investment securities in unrealized loss position \| Security	1	20

Investments - Summary of Gross Unrealized Losses and Fair Value of Available-For-Sale Investment Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value		$ 220,834
Less Than 12 Months, Unrealized Losses		(51)
12 Months or Greater, Estimated Fair Value	$ 4,003
12 Months or Greater, Unrealized Losses	(1)
Total, Estimated Fair Value	4,003	220,834
Total, Unrealized Losses	(1)	(51)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value		11,334
Less Than 12 Months, Unrealized Losses		(8)
12 Months or Greater, Estimated Fair Value	4,003
12 Months or Greater, Unrealized Losses	(1)
Total, Estimated Fair Value	4,003	11,334
Total, Unrealized Losses	$ (1)	(8)
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value		148,397
Less Than 12 Months, Unrealized Losses		(13)
Total, Estimated Fair Value		148,397
Total, Unrealized Losses		(13)
US Government Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value		61,103
Less Than 12 Months, Unrealized Losses		(30)
Total, Estimated Fair Value		61,103
Total, Unrealized Losses		$ (30)

Fair Value Measurements - Fair Value Measurements of Cash Equivalents, Available-For-Sale Investment Securities and Equity Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	$ 631,604	$ 623,123
Money market fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	282,247	98,084
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	469,889	328,994
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	282,247	98,084
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	161,715	294,129
U.S. Treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	186,395	228,603
U.S. Treasury notes \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	186,395	228,603
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	1,247	2,307
Equity securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	1,247	2,307
US Government Sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	38,556	103,878
US Government Sponsored Enterprises Debt Securities [Member] \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	38,556	103,878
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	90,708	88,039
Corporate debt securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	90,708	88,039
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	32,451	102,212
Commercial paper \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	$ 32,451	$ 102,212

Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended					6 Months Ended
	Sep. 30, 2019	Nov. 30, 2018	Aug. 31, 2016	Jan. 31, 2016	Dec. 31, 2012	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs	$ 271,500,000	$ 298,500,000	$ 215,900,000	$ 281,600,000		$ 51,155,000	$ 8,822,000
Share of common stock issued	7,187,500	18,602,941	6,969,696	10,344,827	19,000,000
Value of shares purchased by Baker Entities in public offerings						$ 15,000		$ 15,000
Proceed from sale of stock and warrants					$ 80,500,000
Common stock sale price per share					$ 4.43
Expire on December 17, 2019
Class of Stock [Line Items]
Warrants issued					500,000
Warrants issuance price per share					$ 4.42
Warrant exercise price					$ 0.01
Issuance of warrant value					$ 2,200,000
Warrants outstanding					500,000	493,145
Description of warrant						Per their terms, the warrants to purchase 500,000 shares of common stock, of which 493,145 remained outstanding at June 30, 2020, may not be exercised if the holder’s ownership of the Company’s common stock would exceed 19.99 percent following such exercise.
Registration Rights Agreement
Class of Stock [Line Items]
Expiration period				10 years
Maximum amount of expense agreed to bear under the agreement				$ 50,000
Registration Rights Agreement \| Baker Brothers Life Sciences L.P.
Class of Stock [Line Items]
Value of shares purchased by Baker Entities in public offerings	$ 62,500,000	$ 200,000,000.0	$ 43,000,000.0	$ 75,000,000.0
Option To Purchase Additional Shares
Class of Stock [Line Items]
Share of common stock issued	937,500	2,426,470	909,090

Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended			3 Months Ended				6 Months Ended
	Mar. 31, 2020	Aug. 31, 2018	May 31, 2018	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Obligation expiration year								2021
Gain (loss) on strategic investment								$ (1,060,000)	$ (241,000)
Restricted cash				$ 5,770,000		$ 4,787,000		5,770,000	4,787,000	$ 4,787,000	$ 4,826,000
Letter of Credit \| Corporate Credit Card Program
Other Commitments [Line Items]
Restricted cash				2,000,000.0				2,000,000.0
Letter of Credit \| Fleet Program
Other Commitments [Line Items]
Restricted cash				400,000				400,000
Other assets
Other Commitments [Line Items]
Aggregate carrying amount of strategic equity investment				1,200,000				1,200,000		$ 2,300,000
Other expense
Other Commitments [Line Items]
Gain (loss) on strategic investment				400,000		$ (12,000)		$ (1,100,000)	$ (200,000)
Exclusivity Deed \| Neuren
Other Commitments [Line Items]
Aggregate carrying amount of strategic equity investment			$ 3,100,000
Shares subscribed			1,330,000
Exclusivity Deed \| Neuren \| Selling, general and administrative
Other Commitments [Line Items]
Payments for exclusive right			$ 900,000
License Agreements \| Neuren \| North America
Other Commitments [Line Items]
Upfront license fee	$ 10,000,000.0	$ 10,000,000.0
License Agreements \| Neuren \| Research and development \| North America
Other Commitments [Line Items]
Upfront payment					$ 10,000,000.0		$ 10,000,000.0
Maximum
Other Commitments [Line Items]
Percentage of royalty payments obligation on net product sales								2.00%
Mile stone payments payable				$ 1,100,000,000				$ 1,100,000,000
Maximum \| License Agreements \| Neuren \| North America
Other Commitments [Line Items]
Mile stone payments payable	$ 515,000,000.0	$ 455,000,000.0			$ 515,000,000.0

Leases - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Leases - Additional Information (Detail) $ in Thousands	Mar. 31, 2020 USD ($) ft²	Jun. 30, 2020 USD ($)	Feb. 29, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) ft²
Lessee Lease Description [Line Items]
Operating lease, description		The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 1.5 year to 5.6 years, one of which includes an option to extend the lease for one five-year term.
Operating lease, option to extend		true
Operating lease, options to extend		one of which includes an option to extend the lease for one five-year term.
Operating lease, renewal term		5 years
Weighted average remaining lease term		4 years 9 months 18 days
Weighted average discount rate		8.00%
Restricted cash		$ 5,770		$ 4,787	$ 4,787	$ 4,826
Corporate Office Space Lease Agreement
Lessee Lease Description [Line Items]
Operating leases arrangement term			10 years 7 months			10 years 9 months
Corporate Office Space Lease Agreement \| Letter of Credit
Lessee Lease Description [Line Items]
Restricted cash		$ 3,100
California \| Corporate Office Space Lease Agreement
Lessee Lease Description [Line Items]
Office space leases in square feet \| ft²	67,020		30,608			67,020
Minimum lease payment amount	$ 51,400		$ 25,300			$ 50,400
Lease commencement period	third quarter of 2020
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease remaining lease term		1 year 6 months
Maximum
Lessee Lease Description [Line Items]
Operating lease remaining lease term		5 years 7 months 6 days

Leases - Summary of Operating Lease Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease Cost [Abstract]
Operating lease cost	$ 1,428	$ 1,271	$ 2,915	$ 2,546

Leases - Supplemental Cash Flow Information Related to the Company's Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease Cost [Abstract]
Operating cash flows from operating leases	$ 1,291	$ 1,228	$ 2,582	$ 2,357
Right-of-use assets obtained in exchange for operating lease obligations:	$ 105	$ 200	$ 381	$ 11,951

Leases - Summary of Balance Sheet Classification of Lease Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Current portion of lease liabilities	$ 2,653	$ 3,434
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Operating lease liabilities	$ 5,669	$ 6,361
Total operating lease liabilities	$ 8,322	$ 9,795

Leases - Summary of Maturities of Lease Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating Lease Liabilities [Abstract]
Remainder of 2020	$ 1,390
2021	2,735
2022	2,210
2023	1,369
2024	1,114
Thereafter	1,011
Total lease payments	9,829
Less:
Imputed interest	(1,507)
Total operating lease liabilities	$ 8,322	$ 9,795