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License Agreements (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2012
item
Jan. 09, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
shares
Research and Development Arrangement, Contract to Perform for Others [Line Items]            
Number of common shares | shares   37,075,422       36,933,217
Value of common stock   $ 3,707       $ 3,693
Research and development expense recognized   27,521,400 $ 7,603,081      
Pfizer Inc | License Agreements            
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          
Prior trading days 10 days          
Share price | $ / shares $ 97.54          
Upfront cash payment $ 3,000,000          
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        
Pfizer Inc | License Agreements | AXS-04            
Research and Development Arrangement, Contract to Perform for Others [Line Items]            
License agreement royalty as a percent of net sales       1.50%    
Antecip | License Agreements            
Research and Development Arrangement, Contract to Perform for Others [Line Items]            
Number of exclusive license agreements | item       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    
Antecip | License Agreements | AXS-02            
Research and Development Arrangement, Contract to Perform for Others [Line Items]            
License agreement royalty as a percent of net sales       4.50%    
Antecip | License Agreements | AXS-05            
Research and Development Arrangement, Contract to Perform for Others [Line Items]            
License agreement royalty as a percent of net sales       3.00%