Commitments and Contingencies - Schedule of Lease Costs and Weighted-Average Assumptions Used in Determining its Lease Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Operating lease cost	$ 739	$ 686
Cash paid for operating leases	739	695
Right-of-use assets obtained in exchange for operating lease liabilities
Upon adoption of Topic 842		839
New leases commenced during the period	$ 585	$ 997
Weighted average remaining term for operating leases	1 year 4 months 24 days	1 year 11 months 8 days
Weighted average discount rate for operating leases	6.00%	6.00%