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Leases - Lease Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Lease, cost        
Amortization of right-of-use assets $ 152 $ 258 $ 500 $ 1,237
Interest on lease liabilities 74 88 223 275
Operating lease cost 852 412 1,764 1,941
Short-term lease cost 288 671 1,261 1,377
Variable lease cost 9 10 30 147
Total lease cost $ 1,375 $ 1,439 3,778 4,977
Operating cash flows from finance leases     223 275
Operating cash flows from operating leases     2,514 1,678
Financing cash flows from finance leases     1,085 1,026
Right-of-use assets obtained in exchange for new finance lease liabilities     0 158
Right-of-use assets obtained in exchange for new operating lease liabilities     $ 6,392 $ 59
Weighted-average remaining lease term - finance leases 3 years 1 month 6 days 3 years 8 months 12 days 3 years 1 month 6 days 3 years 8 months 12 days
Weighted-average remaining lease term - operating leases 3 years 1 month 6 days 2 years 3 years 1 month 6 days 2 years
Weighted-average discount rate - finance leases 6.40% 6.10% 6.40% 6.10%
Weighted-average discount rate - operating leases 6.60% 8.50% 6.60% 8.50%