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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |
Increase (decrease) in deferred tax assets valuation allowance | $ 49,600 | $ 42,000 | $ 45,500
Deferred tax assets, net operating loss carryforwards for federal | 764,600 |  |
Deferred tax assets, net operating loss carryforwards for state | 338,900 |  |
Research and development tax credit carryforwards | 54,336 | 44,264 |
Refundable research tax credits recognized | 5,900 | 5,100 | 4,700
Accrued interest and/or penalties | 300 | 200 |
Unrecognized tax benefits that would impact effective tax rate | 1,200 | 1,200 | $ 1,200
Prepaid Expenses and Other Current Assets |  |  |
Income Taxes [Line Items] |  |  |
Refundable research tax credits | 3,100 | 2,000 |
Other noncurrent assets |  |  |
Income Taxes [Line Items] |  |  |
Refundable research tax credits | 15,300 | $ 12,100 |
French |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax assets, net operating loss carryforwards for foreign | 118,700 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Research and development tax credit carryforwards | 45,300 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Research and development tax credit carryforwards | $ 31,300 |  |

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