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Commitments and Contingencies - Future minimum rental payments under operating leases with noncancelable terms (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
2021 (excluding the six months ended June 30, 2021) $ 786  
2022 1,603  
2023 1,647  
2024 443  
Total minimum lease payments 4,479  
Less: imputed interest (321)  
Present value of operating lease obligations 4,158  
Less: current portion (1,484) $ (712)
Noncurrent operating lease obligations $ 2,674 $ 1,727