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INCOME TAXES - EFFECTIVE INCOME TAX RATE (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract] |  |  |
Tax at statutory rate | 21.00% | 21.00% | 21.00%
State income tax, net of federal benefit | 9.00% | 6.90% | 12.20%
Federal and state tax credits | 5.70% | 5.30% | 4.00%
Stock-based compensation | (1.20%) | (0.50%) | (0.80%)
Net operating loss not benefitted | (5.40%) | (6.90%) | (5.80%)
Other | (0.20%) | (0.30%) | (0.20%)
Change in valuation allowance | (28.90%) | (25.50%) | (30.40%)
Effective tax rate | 0.00% | 0.00% | 0.00%

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