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Warrants - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 15, 2020
Oct. 18, 2020
Oct. 31, 2020
Jul. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 19, 2020
Mar. 12, 2020
Mar. 10, 2020
Oct. 31, 2018
Warrants                    
Exercise price of warrants (in dollars per share)   $ 15.0 $ 15.0              
Warrants and Rights Outstanding, Term (Year)             5 years 5 years 5 years  
Exercise price of warrants (in dollars per share)                 $ 14.375 $ 15.0
Warrants Issued in Connection with March Offerings                    
Warrants                    
Class of Warrant or Right, Issued During Period (in shares)       92,302            
Exercise price of warrants (in dollars per share)       $ 15.99            
Warrants and Rights Outstanding, Term (Year)       1 year            
Warrants outstanding       $ 0.1            
December 15, 2020 Offering                    
Warrants                    
Class of Warrant or Right, Issued During Period (in shares) 311,458                  
Exercise price of warrants (in dollars per share) $ 7.50                  
Warrants and Rights Outstanding, Term (Year) 5 years                  
Warrants outstanding $ 1.3                  
Liability Warrants                    
Warrants                    
Outstanding warrants         24,105 24,105        
Other Warrants Expired                    
Warrants                    
Warrants expired         3,416          
Weighted Average | Liability Warrants                    
Warrants                    
Exercise price of warrants (in dollars per share)         $ 720.0 $ 720.0