Commitments and Contingencies - Summary of Right of Use Assets and Lease Liabilities Related to Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets And Liabilities Lessee [Abstract]
Right-of-use assets	$ 959	$ 1,058
Lease liabilities － Current	720	549
Lease liabilities － Non-Current	$ 270	$ 518
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities	$ 990	$ 1,067