Commitments and Contingencies - Schedule of ROU Assets and Liabilities Related to 2014 Lease and Temporary Lease (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
ROU assets (included in other assets)	$ 373
Operating lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Lease liabilities, current portion (included in accounts payable and accrued liabilities)	$ 0
Operating lease, liability, current, statement of financial position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Lease liabilities, net of current portion	$ 689	$ 393
Total lease liabilities	$ 689