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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 02, 2021
Aug. 31, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2010
Class of Stock [Line Items]                          
Issuance of common stock in connection with asset acquisition                   $ 0 $ 44,280,000    
Net proceeds from sale of common stock       $ 271,500,000           $ 18,162,000 80,996,000 $ 371,847,000  
Issuance of common stock in public offering, net of issuance costs (in shares)       7,187,500                  
Options vesting period                   4 years      
Aggregate intrinsic value of stock options exercised                   $ 8,000,000.0 55,500,000 $ 56,600,000  
Cash received from options exercised                   $ 12,900 73,800,000    
Weighted average per share fair value of options granted                   $ 24.07   $ 15.97  
Unrecognized compensation costs                     $ 99,100,000    
Weighted average period cost expected to be recognized                   2 years 3 months 18 days 2 years 6 months    
Weighted average remaining contractual term, Outstanding                   5 years 9 months 18 days      
Terms of award                   PSUs for which the number of shares issuable at the end of performance period can reach up to 200% of the shares approved in the award based on the achievement of certain pre-defined Acadia-specific performance criteria and continued employment through the vesting period      
Issuance of common stock pursuant to employee stock purchase plan                   $ 5,312,000 $ 7,162,000 $ 4,411,000  
Potential payout $ 15,100,000                 14,600,000      
Fair value of awards $ 4,400,000                 5,600,000      
Compensation cost related to the awards                   $ 600,000      
Stock Options | Equity Incentive Plan 2010                          
Class of Stock [Line Items]                          
Exercise price of Options as percentage of fair market value                         100.00%
Options maximum expiration term                         10 years
Options vesting period                         4 years
Number of common stock authorized for issuance                   27,357,064      
Common stock available for grants                   9,590,133      
Common stock reserved for issuance under stock purchase plan         8,300,000 6,700,000 5,500,000 3,000,000 5,000,000        
Stock Options | Equity Incentive Plan 2004                          
Class of Stock [Line Items]                          
Exercise price of Options as percentage of fair market value                   100.00%      
Options vesting period                   4 years      
Number of periods additional number of shares could be added to shares authorized for issuance                   10 years      
PSU                          
Class of Stock [Line Items]                          
Unrecognized compensation costs                   $ 11,500,000 $ 2,600,000    
Weighted average period cost expected to be recognized                     2 years 8 months 12 days    
Weighted average remaining contractual term, Outstanding                   3 years 3 months 18 days 2 years 9 months 18 days    
Granted                   918,434 255,878    
Aggregate Intrinsic Value, Outstanding                   $ 29,800,000 $ 37,400,000    
Outstanding shares                   1,276,936 700,156    
Restricted Stock Units                          
Class of Stock [Line Items]                          
Unrecognized compensation costs                   $ 39,800,000 $ 41,700,000    
Weighted average period cost expected to be recognized                   2 years 3 months 18 days      
Employee Stock Purchase Plan                          
Class of Stock [Line Items]                          
Number of common stock authorized for issuance                     5,525,000    
Common stock reserved for issuance under stock purchase plan     3,000,000   600,000     400,000          
Common stock remained available for issuance pursuant to the Purchase Plan                   2,810,145      
Eligible employees percentage of earnings withheld to purchase shares under purchase plan                   15.00%      
Purchase price of common stock as percentage of market value                   85.00%      
Issuance of common stock pursuant to employee stock purchase plan                   296,850 377,963 269,037  
Average per share price of stock issued under purchase plan                   $ 17.89 $ 18.94 $ 16.41  
Weighted average per share fair value of purchase rights granted                   $ 23.97 $ 22.47 $ 14.24  
Issuance of common stock pursuant to employee stock purchase plan                   $ 5,300,000 $ 7,200,000 $ 4,400,000  
Option To Purchase Additional Shares                          
Class of Stock [Line Items]                          
Issuance of common stock in public offering, net of issuance costs (in shares)       937,500                  
Cersci Therapeutics                          
Class of Stock [Line Items]                          
Issuance of common stock in connection with asset acquisition (in shares)   1,200,000                      
Issuance of common stock in connection with asset acquisition   $ 44,300,000