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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Commitments And Contingencies Disclosure [Line Items]    
Contingent milestone payments $ 2,400  
Supply Agreement    
Commitments And Contingencies Disclosure [Line Items]    
Purchase obligation 2,543  
Purchases under supply agreements $ 1,677 $ 0