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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Kite Pharma, Inc. (Narrative) (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 06, 2018 USD ($) milestone | Apr. 05, 2018 USD ($) option | Sep. 30, 2019 USD ($) performance_obligation material_right | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Accounts receivable |  |  |  | $ 923,000 | $ 3,678,000
Kite Pharma, Inc. | License |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contract with customer liability |  | $ 150,000,000 |  |  |
Number of remaining performance obligations | performance_obligation |  |  | 4 |  |
Number of material rights for renewal of research period | material_right |  |  | 2 |  |
Renewal period |  |  | 1 year |  |
Fixed consideration |  |  | $ 150,000,000 |  |
Remaining performance obligation amount |  |  |  | 0 | 19,700,000
Kite Pharma, Inc. | Collaboration and License Agreement |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Milestone payments received | $ 150,000,000 |  |  |  |
Initial research term of agreement |  | 6 years |  |  |
Number of options to extend initial research term | option |  | 2 |  |  |
Extended research term of agreement |  | 1 year |  |  |
Separate fee for additional term |  | $ 10,000,000 |  |  |
Contract with customer liability |  |  |  | 0 | 19,400,000
Accounts receivable |  |  |  | 200,000 | $ 700,000
Kite Pharma, Inc. | Collaboration and License Agreement | Achievement of specified research, clinical development, regulatory and first commercial sale milestones |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contingent development and sales-based milestone payments to be received | 1,300,000,000 |  |  |  |
Kite Pharma, Inc. | Collaboration and License Agreement | Achievement of specified sales-based milestones if annual worldwide net sales of licensed products reach specified levels |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Contingent development and sales-based milestone payments to be received | $ 1,800,000,000 |  |  |  |
Maximum amount of achieved milestones to receive payment | milestone | 10 |  |  |  |
Kite Pharma, Inc. | Collaboration and License Agreement | Maximum |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Development and sales-based milestone payments to be received | $ 3,000,000,000 |  |  |  |
Kite Pharma, Inc. | Collaborative Arrangement | Change in Agreement Estimate, March and September 2023 |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Increase (decrease) in revenue |  |  |  | 13,900,000 |
Increase (decrease) in net loss |  |  |  | $ 13,900,000 |
Increase (decrease) in basic net loss per share | $ / shares |  |  |  | $ 0.08 |
Increase (decrease) in diluted net loss per share | $ / shares |  |  |  | $ 0.08 |

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