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COMMITMENTS AND CONTINGENCIES - Contractual Obligations and Commercial Commitments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Outstanding letters of credit | $ 13,600 |  |  |
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable | 48,300 |  |  |
Uncertain Tax Positions |  |  |  |
Gross unrecognized tax benefits | 15,507 | $ 17,496 | $ 18,728 | $ 20,137
Unrecognized tax benefits that would impact the annual effective tax rate if recognized | 540 | $ 829 | $ 2,061 |
Unrecognized tax benefits if recognized, would impact certain deferred tax assets | $ 15,000 |  |  |

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