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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) segment shares | Dec. 31, 2023 USD ($) $ / shares shares | Apr. 30, 2025 USD ($) | Apr. 05, 2018 USD ($)
Change in Accounting Estimate [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 41,918 | $ 45,204 |  |
Proceeds from at-the-market offering, net of offering expenses |  | 7,132 | 15,106 |  |
Accounts receivable |  | 526 | $ 923 |  |
Letter of credit |  | $ 1,500 |  |  |
Stock options, RSUs outstanding and ESPP shares reserved (in shares) | shares |  | 50.5 | 21.3 |  |
Number of operating segments | segment |  | 1 |  |  |
Forecast |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Proceeds from at-the-market offering, net of offering expenses | $ 10,100 |  |  |  |
Kite Pharma, Inc. |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Increase (decrease) in revenue |  |  | $ 13,900 |  |
Increase (decrease) in net loss |  |  | $ (13,900) |  |
Increase (decrease) in basic net loss per share | $ / shares |  |  | $ (0.08) |  |
Increase (decrease) in diluted net loss per share | $ / shares |  |  | $ (0.08) |  |
Kite Pharma, Inc. | License |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Contract with customer liability |  |  |  |  | $ 150,000
Eli Lilly | License | Forecast |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Contract with customer liability |  |  |  | $ 5,000 |
Minimum |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Estimated useful lives of related assets |  | 3 years |  |  |
Maximum |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Estimated useful lives of related assets |  | 5 years |  |  |

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