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Income Taxes - Components of deferred tax assets (liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Components of deferred tax assets    
Net operating loss carryforwards $ 22,603 $ 14,793
Accruals and reserves 175 39
Stock based compensations 1,607 1,153
Research and development credits 2,692 2,021
Deferred revenue 1,454 1,338
Depreciation and amortization   (9)
Total 28,531 19,335
Valuation allowance $ (28,531) $ (19,335)