Income Taxes - Significant Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carry forwards	$ 5,869	$ 2,335
Research and development tax credits	90	168
Stock based compensation and other	5,099	5,263
Operating lease obligation	2,149
Total deferred tax assets	13,207	7,766
Less: Valuation allowance	(11,326)	(7,032)
Deferred tax liabilities	(55)	$ (734)
Operating lease right-of-use assets	$ (1,826)