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Warrants - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 09, 2020
Sep. 30, 2020
Sep. 30, 2020
Aug. 21, 2020
Sep. 22, 2017
Class Of Warrant Or Right [Line Items]          
Purchase of common stock upon exercise of warrants       410,239  
Warrants initial exercise price         $ 0.01
Warrant expense   $ 1,525 $ 3,109    
OrbiMed Royalty & Credit Opportunities, LP.          
Class Of Warrant Or Right [Line Items]          
Purchase of common stock upon exercise of warrants 410,239        
Warrants initial exercise price $ 16.10        
Unamortized debt discount   2,064 2,064    
Warrant expense $ 2,359 $ 1,525 $ 3,109    
OrbiMed Royalty & Credit Opportunities, LP. | Warrants          
Class Of Warrant Or Right [Line Items]          
Fair value of the Warrants $ 2,359