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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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