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SELECTED QUARTERLY FINANCIAL INFORMATION - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Selected Quarterly Financial Information [Line Items] |  |  |  |  |
Defined contribution plan charges recognized | $ 4,300 |  |  |  |
Current income tax benefit | 1,700 |  | $ 941 | $ 12,182 | $ (30,671)
Patent Infringement |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |
Accrual insurance related assessment premium tax offset | 8,400 |  |  |  |
United States Department Of Transportation | Grant |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |
Grant received | $ 7,600 |  |  |  |
Federal |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease) |  | $ 14,100 | $ 6,000 | $ 23,300 |

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