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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | $ 33,700 |  |
Deferred research and development credit carryforwards | 3,739 |  |
Minimum tax credit carryforwards | 31 | $ 123 |
Carryforwards indefinitely | $ 4,500 |  |
Maximum percentage of taxable income offset by carryforward allowed | 80.00% |  |
Decrease in valuation allowance | $ 14,849 |  |
Unrecognized tax benefits | 856 | $ 1,435 | $ 1,174
Interest and penalties | $ 0 |  |
Minimum |  |  |
Income Tax Examination [Line Items] |  |  |
Carryforwards expiration date | 2020 |  |
Maximum |  |  |
Income Tax Examination [Line Items] |  |  |
Carryforwards expiration date | 2038 |  |

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