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Commitment & Contingencies - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]        
Operating lease cost $ 60 $ 38 $ 120 $ 53
Variable lease cost 11 0 71 0
Short-term lease cost 63 0 95 0
Total lease cost $ 134 $ 38 $ 286 $ 53