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Warrants - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 26, 2018
Aug. 31, 2017
Aug. 30, 2016
May 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Warrants                  
Reclassification of fair value of warrant liability to shareholders' equity $ 5,203,000                
Proceeds from exercise of warrants         $ 1,998,000     $ 0 $ 1,998,000
Value of common stock issued           $ 282,833,000 $ 281,100,000    
FCCDC Warrants                  
Warrants                  
Number of securities called by warrants (shares)       100,000          
Exercise price of warrants (in dollars per share)       $ 56.46          
Guarantor and Co-Guarantor Warrants                  
Warrants                  
Number of securities called by warrants (shares)         107,500        
Exercise price of warrants (in dollars per share)         $ 9.2911        
FCCDC Agreement | Collaborative arrangement                  
Warrants                  
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          
Credit Agreement | Wells Fargo Term Loan                  
Warrants                  
Credit agreement term     1 year            
Principal amount     $ 5,000,000            
Proceeds from borrowings     $ 5,000,000            
Principal repayment   $ 5,000,000