Commitments and Contingencies - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease, right-of-use asset, net	$ 1,665	$ 3,117
Current portion of operating lease liabilities	907	1,294
Operating lease liabilities, net of current portion	889	$ 2,020
Total operating lease liabilities	$ 1,796