XML 62 R45.htm IDEA: XBRL DOCUMENT v3.20.4
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2010
Class of Stock [Line Items]                        
Issuance of common stock in connection with asset acquisition                 $ 44,280      
Net proceeds from sale of common stock     $ 271,500           $ 80,996 $ 371,847 $ 306,647  
Issuance of common stock in public offering, net of issuance costs (in shares)     7,187,500                  
Options vesting period                 4 years      
Closing market price of Common stock                 $ 53.46      
Aggregate intrinsic value of stock options exercised                 $ 55,500 $ 56,600 $ 11,200  
Cash received from options exercised                 $ 73,800      
Weighted average per share fair value of options granted                 $ 24.16 $ 15.97 $ 12.14  
Unrecognized compensation costs                 $ 99,100      
Weighted average period cost expected to be recognized                 2 years 6 months      
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                 $ 7,162 $ 4,411 $ 3,682  
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                 28,426,504      
Common stock available for grants                 9,777,263      
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                 $ 2,600      
Weighted average period cost expected to be recognized                 1 year 6 months      
Granted                 255,878 481,036    
Aggregate Intrinsic Value, Outstanding                 $ 37,400      
Outstanding shares                 700,156 448,632    
Restricted Stock Units                        
Class of Stock [Line Items]                        
Unrecognized compensation costs                 $ 41,700      
Weighted average period cost expected to be recognized                 2 years 8 months 12 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                 3,106,995      
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                 377,963 269,037 233,720  
Average per share price of stock issued under purchase plan                 $ 18.94 $ 16.41 $ 15.75  
Weighted average per share fair value of purchase rights granted                 $ 22.47 $ 14.24 $ 8.25  
Issuance of common stock pursuant to employee stock purchase plan                 $ 7,200 $ 4,400 $ 3,700  
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, Shares 1,200,000                      
Issuance of common stock in connection with asset acquisition $ 44,300