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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | $ 48,435 |  |
Deferred research and development credit carryforwards | 3,579 |  |
Carryforwards indefinitely | $ 16,962 |  |
Maximum percentage of taxable income offset by carryforward allowed | 80.00% |  |
Increase in valuation allowance | $ 1,688 |  |
Unrecognized tax benefits | 587 | $ 856 | $ 1,435
Unrecognized tax benefit that would impact effective tax rate | 15 |  |
Interest and penalties | $ 0 |  |
Minimum |  |  |
Income Tax Examination [Line Items] |  |  |
Carryforwards expiration year | 2021 |  |
Maximum |  |  |
Income Tax Examination [Line Items] |  |  |
Carryforwards expiration year | 2040 |  |

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