Leases - Summary of Lease Costs and Other Information to Company's Finance and Operating Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Lease Cost
Amortization of finance right-of-use assets	$ 141	$ 392	$ 0
Interest on finance lease liabilities	22	67
Operating lease cost	63	168
Short-term lease cost	118	367
Total lease cost	344	994
Cash paid for amounts included in the measurement of lease liability – finance leases	67	67
Cash paid for amounts included in the measurement of lease liability – operating leases	$ 105	$ 105
Weighted-average remaining lease term – finance leases	1 year 9 months 29 days	1 year 9 months 29 days
Weighted-average remaining lease term – operating leases	4 years 11 months 15 days	4 years 11 months 15 days
Weighted-average discount rate – finance leases	10.20%	10.20%
Weighted-average discount rate – operating leases	10.40%	10.40%