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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Change in Accounting Estimate [Line Items] |  |  |  |  |
Capital resources | $ 241,000 | $ 241,000 |  |  |
Net income (loss) |  | 21,133 | $ (43,977) | $ (192,300) | $ (178,300)
Accumulated deficit | 1,127,412 | 1,127,412 |  | $ 1,148,545 |
Letter of credit established as a deposit | 1,500 | $ 1,500 |  |  |
Kite Pharma, Inc. |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Change in estimate of transaction price, increase in revenue | 8,900 |  |  |  |
Increase in net income | $ 8,900 |  |  |  |
Increased earnings per share, basic (in dollars per share) | $ 0.06 |  |  |  |
Increased earnings per share, diluted (in dollars per share) | $ 0.05 |  |  |  |

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