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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares
Change in Accounting Estimate [Line Items] |  |
Capital resources | $ 132.1 | $ 132.1
Letter of credit established as a deposit | 1.5 | 1.5
Kite Pharma, Inc. | Change In Agreement Estimate, March 2023 |  |
Change in Accounting Estimate [Line Items] |  |
Increase in revenue |  | 8.9
Decrease in net loss |  | $ 8.9
Decreased net loss per share, basic (in dollars per share) | $ / shares |  | $ 0.05
Decreased net loss per share, diluted (in dollars per share) | $ / shares |  | $ 0.05
Kite Pharma, Inc. | Change In Estimate, September 2023 |  |
Change in Accounting Estimate [Line Items] |  |
Increase in revenue | 4.9 | $ 4.9
Decrease in net loss | $ 4.9 | $ 4.9
Decreased net loss per share, basic (in dollars per share) | $ / shares | $ 0.03 | $ 0.03
Decreased net loss per share, diluted (in dollars per share) | $ / shares | $ 0.03 | $ 0.03

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