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INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Loss and credit carryforwards | $ 1,888 | $ 4,779
Stock-based compensation | 1,603 | 1,004
Other | 745 | 1,133
Total deferred tax assets | 4,236 | 6,916
Valuation allowance | (3,837) | (6,472)
Total deferred tax assets, net of valuation allowance | 399 | 444
Deferred tax liabilities: |  |
Property and equipment | (278) | (245)
Other | (121) | (199)
Total deferred tax liabilities | (399) | (444)
Net deferred tax assets | $ 0 | $ 0

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