Income Taxes - Schedule of Net Deferred Tax Assets/(Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 20,909	$ 17,338
R&D Tax Credit carryforwards	1,755	1,587
Investment in partnerships liabilities	(2,353)	(1,520)
Charitable contributions	11	12
Total deferred tax assets	20,322	17,417
Valuation allowance	$ (20,322)	$ (17,417)