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COMMITMENTS AND CONTINGENCIES - Contractual Obligations and Commercial Commitments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Outstanding letters of credit | $ 14,200 |  |  |
Outstanding purchase commitments, including agreements that are non-cancelable | 2,300 |  |  |
Uncertain Tax Positions |  |  |  |
Gross unrecognized tax benefits | 3,404 | $ 15,507 | $ 17,496 | $ 18,728
Unrecognized tax benefits that would impact the annual effective tax rate if recognized | 541 | $ 540 | $ 829 |
Unrecognized tax benefits if recognized, would impact certain deferred tax assets | $ 2,900 |  |  |

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