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Commitments and Contingencies - Costs Included in Cash Flow Statement (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]    
Operating lease cost $ 886 $ 440
Cash paid for amounts included in the measurement of lease liabilities 465 $ 478
Lease liability $ 20,777