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License and Other Agreements - Fox Chase Chemical Diversity Center Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
License and other agreements              
Value of common stock issued     $ 282,833,000 $ 21,221,000 $ 281,100,000    
Research and development   $ 57,044,000   61,674,000   $ 155,539,000 $ 278,654,000
FCCDC Agreement | Collaborative arrangement              
License and other agreements              
Common stock issued (shares) 100,000            
Value of common stock issued $ 5,646,000            
Development milestone payment to be paid 4,500,000            
Development milestone payments to be paid per each additional NDA filing 1,000,000            
Performance milestone payment to be paid $ 1,500,000            
Time period for payment of performance milestone 30 months            
Research and development   $ 500,000   $ 0   $ 1,365,000 $ 0
FCCDC Agreement | Collaborative arrangement | Minimum              
License and other agreements              
Earned royalty payment per agreement (percent) 0.00%            
FCCDC Agreement | Collaborative arrangement | Maximum              
License and other agreements              
Earned royalty payment per agreement (percent) 10.00%            
FCCDC Warrants              
License and other agreements              
Number of securities called by warrants (shares) 100,000            
Exercise price of warrants (in dollars per share) $ 56.46