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INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Loss and credit carryforwards $ 4,256 $ 1,888
Stock-based compensation 1,701 1,603
Accrued bonus 555 0
Other 886 745
Total deferred tax assets 7,398 4,236
Valuation allowance (6,968) (3,837)
Total deferred tax assets, net of valuation allowance 430 399
Deferred tax liabilities:    
Property and equipment (205) (278)
Other (225) (121)
Total deferred tax liabilities (430) (399)
Net deferred tax assets $ 0 $ 0