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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Line Items] |  |  |
U.S. federal tax at statutory rate | 21.00% | 21.00% | 21.00%
Current income tax expense (benefit) | $ 1,624 | $ 0 | $ 0
Deferred income tax expense (benefit) | 0 | 0 | 0
Increase (decrease) in valuation allowance, deferred tax assets | 5,800 | 22,500 | 4,700
Research and development tax credit carryforwards | 7,726 | 6,152 |
Decrease in deferred tax asset | 44,900 |  |
Income tax paid, state and local, after refund received | 700 | 0 | 0
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | 1,240,800 | 1,245,800 | 1,230,400
Net operating loss carryforwards indefinitely due to tax cut and jobs act | 663,800 |  |
Research and development tax credit carryforwards | 5,000 |  |
State |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | 562,200 | $ 584,300 | $ 590,800
Research and development tax credit carryforwards | $ 3,400 |  |

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