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SEGMENTS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) segment | Jun. 30, 2025 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of operating segments | segment |  |  | 1 |
Number of reportable segments | segment |  |  | 1 |
Segment Reporting [Line Items] |  |  |  |
Revenue | $ 0 | $ 212 | $ 212 | $ 424
Research and development: | 758 | 6,074 | 3,629 | 11,799
Net income (loss) | 43,665 | (9,703) | 35,387 | (19,142)
Reporting Segment |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Revenue | 0 | 212 | 212 | 424
General and administrative, excluding personnel expenses | 3,726 | 1,472 | 7,949 | 2,997
General and administrative, personnel expenses (including share-based compensation) | 1,169 | 2,723 | 3,020 | 5,355
Other segment items | (49,318) | (354) | (49,773) | (585)
Net income (loss) | 43,665 | (9,703) | 35,387 | (19,142)
Reporting Segment | Candid Merger |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Termination fee |  |  | 50,000 |
Reporting Segment | RLYB212 |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Research and development: | (48) | 1,377 | 8 | 3,815
Reporting Segment | RLYB116 |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Research and development: | 525 | 1,274 | 921 | 1,893
Reporting Segment | Other program candidates |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Research and development: | 5 | 95 | 7 | (68)
Reporting Segment | Personnel expenses (including share-based compensation) |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Research and development: | 180 | 3,161 | 2,460 | 5,750
Reporting Segment | Other expenses |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Research and development: | $ 96 | $ 167 | $ 233 | $ 409

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