Operating Leases and Right-of-Use Assets - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease, right-of-use asset, net	$ 659	$ 903	$ 3,117
Current portion of operating lease liabilities	492	830
Operating lease liabilities, net of current portion	236	602
Total operating lease liabilities	$ 728	$ 1,432	$ 3,314