Income Taxes - Significant Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Net operating loss carry forwards	$ 10,988	$ 5,869
Research and development tax credits	90	90
Stock based compensation and other	2,860	5,099
Operating lease obligation	1,789	2,149
Total deferred tax assets	15,727	13,207
Less: Valuation allowance	(15,106)	(11,326)
Deferred tax liabilities		(55)
Operating lease right-of-use assets	$ (621)	$ (1,826)