Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 2,450	$ 3,108
Office and other equipment, net of accumulated depreciation and amortization	74	614
Total lease assets	2,524	3,722
Operating Lease, Liability [Abstract]
Operating lease liability, current	773	570
Operating lease liability, noncurrent	1,840	2,539
Finance Lease Liability [Abstract]
Finance lease liability, current	69	206
Finance lease liability, noncurrent	5	85
Total lease liabilities	$ 2,687	$ 3,400