Commitments and Contingencies - Schedule of Lease Costs and Weighted-Average Assumptions Used in Determining its Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Operating lease cost	$ 200	$ 200	$ 549	$ 501
Cash paid for operating leases	$ 200	$ 200	542	508
Right-of-use assets obtained in exchange for operating lease liabilities			$ 585	$ 839
Weighted average remaining term for operating leases	1 year 7 months 20 days	7 months 28 days	1 year 7 months 20 days	7 months 28 days
Weighted average discount rate for operating leases	6.00%	6.00%	6.00%	6.00%