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Liquidity and Capital Resources - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Aug. 09, 2021
Aug. 21, 2020
Jan. 09, 2020
Sep. 30, 2021
Dec. 31, 2020
Liquidity And Capital Resources [Line Items]          
Accumulated deficit       $ 476,312 $ 488,195
Cash and cash equivalents       189,704 $ 228,631
Proceeds from issuance of common stock   $ 135,435   $ 30,000  
Common Stock | Blackstone Alternative Credit Advisors ("Blackstone")          
Liquidity And Capital Resources [Line Items]          
Proceeds from issuance of common stock $ 30,000        
Number of shares sold 1,048,951        
Shares issued, price per share $ 28.60        
OrbiMed Royalty & Credit Opportunities, LP.          
Liquidity And Capital Resources [Line Items]          
Aggregate proceeds from loan     $ 200,000    
Blackstone Alternative Credit Advisors ("Blackstone")          
Liquidity And Capital Resources [Line Items]          
Aggregate proceeds from loan $ 200,000