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INCOME TAXES - The effective tax rate of the Company's provision (benefit) (Details) 2 - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
INCOME TAXES |  |
Statutory rate | 21.00% | 21.00%
State tax | 3.19% | 7.13%
Foreign income and withholding taxes | 0.41% | 0.08%
Stock-based compensation | (0.60%) | (0.51%)
Change in fair value of warrants | (11.36%) | 0.53%
Other |  | (0.04%)
Non-deductible interest expense | (1.51%) | (2.63%)
Valuation allowance | (11.13%) | (25.56%)
Total | 0.00% | 0.00%
Provisions for federal income taxes | $ 0 | $ 0

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