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Organization and Operations - Liquidity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Common Stock          
Accumulated deficit   $ (446,318)     $ (260,897)
Cash and cash equivalents $ 52,856 $ 131,777 $ 52,856   $ 24,930
Cowen          
Common Stock          
Percentage of commission paid to underwriter based on proceeds from common stock   3.00%      
Jefferies          
Common Stock          
Remaining available under sales agreement       $ 25,000  
Jefferies | ATM          
Common Stock          
Maximum aggregate value of common shares which can be issued under the agreement       $ 25,000  
Common stock          
Common Stock          
Issuance of common stock for at-the-market offerings (in shares) 208,956   392,288    
Common stock | ATM          
Common Stock          
Issuance of common stock for at-the-market offerings (in shares)     392,288    
Share price (in dollars per share) $ 42.76   $ 42.76    
Proceeds from public offering, net of issuance costs     $ 16,300