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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 5,409	$ 3,031
Reserves, accruals and other	198	239
Depreciation and amortization	917	1,284
Deferred stock based compensation	2,691	2,698
Research and development credit carryforwards	6,675	6,613
Total deferred tax assets	15,890	13,865
Less: Valuation allowance	$ (15,890)	$ (13,865)

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