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INCOME TAXES - Summary of Reconciliation Between Income Taxes Computed at Federal Statutory Rate and Provision for Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income taxes at 21% for 2023 and 2022 |  |  |  |  |  |  |  |  | $ (4,723) | $ (7,029) |
Federal statutory income tax rate (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | $ (186) | $ (247) |
Nondeductible expenses |  |  |  |  |  |  |  |  | 260 | 415 |
Tax credits |  |  |  |  |  |  |  |  | (2,076) | (1,877) |
Rate change |  |  |  |  |  |  |  |  | (54) | 491 |
Change in valuation allowance |  |  |  |  |  |  |  |  | 6,373 | (19,684) |
Reserve for uncertain tax positions |  |  |  |  |  |  |  |  | 519 | (10,423) |
162m deferred tax asset limitation |  |  |  |  |  |  |  |  | 128 | 82 |
382 NOL and tax credit limitation |  |  |  |  |  |  |  |  | 0 | 37,513 |
Expired stock awards |  |  |  |  |  |  |  |  | 174 | 1,052 |
Other |  |  |  |  |  |  |  |  | 28 | (21) |
Income tax expense | $ 230 | $ 149 | $ 0 | $ 0 | $ 149 | $ 0 | $ 379 | $ 0 | $ 443 | $ 272 |

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