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Leases - Summary of Lease Costs and Other Information to Company's Finance and Operating Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Lease Cost      
Amortization of financing lease right-of-use assets $ 138 $ 250 $ 0
Interest on finance lease liabilities 25 46  
Operating lease cost 53 105  
Short-term lease cost 134 249  
Variable lease cost 0 0  
Total lease cost 350 650  
Cash paid for amounts included in the measurement of lease liability – finance leases 340 340  
Cash paid for amounts included in the measurement of lease liability – operating leases $ 52 $ 52  
Weighted-average remaining lease term – finance leases 2 years 2 years  
Weighted-average remaining lease term – operating leases 4 years 8 months 1 day 4 years 8 months 1 day  
Weighted-average discount rate – finance leases 10.20% 10.20%  
Weighted-average discount rate – operating leases 10.40% 10.40%