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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in Accounting Estimate [Line Items] |  |  |  |
Letter of credit established as a deposit |  | $ 900 |  |
Cash and cash equivalents | $ 78,241 | $ 54,417 | $ 45,204 | $ 100,444
Kite Pharma, Inc. | Change In Agreement Estimate, March 2023 |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Increase in revenue | 8,900 |  |  |
Decrease in net loss | $ 8,900 |  |  |
Decreased net loss per share, basic (in dollars per share) | $ 0.06 |  |  |
Decreased net loss per share, diluted (in dollars per share) | $ 0.05 |  |  |

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