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License and Other Agreements - Fox Chase Chemical Diversity Center Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
License and other agreements            
Value of common stock issued     $ 282,833 $ 281,100    
Research and development   $ 42,425   $ 175,977 $ 98,495 $ 216,980
FCCDC Agreement | Collaborative arrangement            
License and other agreements            
Common stock issued (shares) 100,000          
Value of common stock issued $ 5,646          
Development milestone payment to be paid 4,500          
Development milestone payments to be paid per each additional NDA filing 1,000          
Performance milestone payment to be paid $ 1,500          
Time period for payment of performance milestone 30 months          
Research and development         $ 1,405 $ 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