Commitments and Contingencies - Schedule of Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Operating lease right-of-use assets	$ 193	$ 314
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other assets
Operating lease liabilities	193	$ 314
Operating Lease, Liability, Statement of Financial Position [Extensible List]		us-gaap:AccountsPayableAndOtherAccruedLiabilities
Finance lease right-of-use assets	241	$ 365
Finance lease accumulated amortization right-of-use assets	(76)	(185)
Property and equipment, net	165	$ 180
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance lease liabilities	$ 202	$ 185
Finance Lease, Liability, Statement of Financial Position [Extensible List]		us-gaap:AccountsPayableAndOtherAccruedLiabilities