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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

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