Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) ft² Facility	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	2 years 1 month 6 days	3 years 1 month 6 days
Lease, option to extend	option to extend for an additional 5 years
Operating lease right-of-use asset	$ 254	$ 272
Operating lease liability	1,262	1,700
Short term portion of operating lease liability	$ 567	$ 482
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Long-term portion of operating lease liability	$ 695	$ 1,262
Lease Facility [Member]
Lessee, Lease, Description [Line Items]
Number of leased facilities | Facility	1
Area of office space | ft²	17,698
Lease start date	Jan. 16, 2014
Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Lease costs	$ 600	$ 500