Income Taxes - Summary of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 19,603,000	$ 19,152,000
Stock-based compensation	1,153,000	1,936,000
Research and development tax credit	2,899,000	2,899,000
Other	235,000	397,000
Non-current deferred tax assets	23,890,000	24,384,000
Valuation allowance	(23,890,000)	$ (24,384,000)
Net deferred tax assets	$ 0