Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Feb. 28, 2022	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Lease commencement date	Jan. 01, 2017
Lease expiry date	Oct. 31, 2022
Operating lease incremental borrowing rate	10.00%	10.00%
Operating lease ROU asset	$ 12,000	$ 142,000		$ 136,000
Operating lease ROU liability	12,000	142,000		$ 136,000
Rent expense	136,000	$ 151,000
Future minimum facility lease payments due in 2022	$ 12,000
Subsequent Event
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Future minimum facility lease payments due in 2022			$ 112,000