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Income Taxes - Schedule of Significant Components Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 9,947	$ 7,126
Research and development tax credits	506	299
Accruals and reserves	43	159
Stock compensation	391	301
Depreciation and amortization	116	126
Lease liability	68
Total deferred tax assets	11,071	8,011
Right-of-use asset	(66)
Total deferred tax liabilities	(66)
Less: valuation allowance	$ (11,005)	$ (8,011)

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