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INCOME TAXES - Summary of Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
NOL Carryforwards |  |
Tax credit carryforwards | $ 14,555 | $ 14,555
Foreign Tax Authority |  |
NOL Carryforwards |  |
Net operating loss carryforwards |  | 3,262
State and Local Jurisdiction |  |
NOL Carryforwards |  |
Net operating loss carryforwards | 2,983 | 1,175
Previous | Domestic Tax Authority |  |
NOL Carryforwards |  |
Net operating loss carryforwards | 2,363 | 2,363
Post | Domestic Tax Authority |  |
NOL Carryforwards |  |
Net operating loss carryforwards | $ 13,017 | $ 1,872

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