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License Agreements - Additional Information (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
item
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2012
item
Jan. 09, 2020
USD ($)
$ / shares
Dec. 31, 2017
$ / shares
Research And Development Arrangement Contract To Perform For Others [Line Items]              
Number of common shares | shares   37,374,088 36,933,217        
Value of common stock   $ 3,737 $ 3,693        
Share price | $ / shares             $ 5.325
Research and development expense recognized   $ 70,244,579 $ 53,647,067 $ 23,495,055      
License Agreement | Antecip              
Research And Development Arrangement Contract To Perform For Others [Line Items]              
Number of exclusive license agreements | item   3     3    
License agreement royalty, maximum reduction percent as a result of required third party payments         50.00%    
License agreement term, from first commercial sale         10 years    
License Agreement | Antecip | AXS-05              
Research And Development Arrangement Contract To Perform For Others [Line Items]              
License agreement royalty as a percent of net sales         3.00%    
Pfizer Inc | License Agreement              
Research And Development Arrangement Contract To Perform For Others [Line Items]              
Number of common shares | shares 82,019            
Value of common stock $ 8,000,000.0            
Prior trading days 10 days            
Share price | $ / shares $ 97.538            
Upfront cash payment $ 3,000,000.0            
Fair value share price | $ / shares           $ 87.24  
Fair value of common stock           $ 7,200,000  
Research and development expense recognized   $ 10,200,000          
Future milestone payments   323,000,000          
Milestone payments or royalties   $ 0