Related-Party Transactions - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Jul. 31, 2026 shares	Jun. 30, 2026 USD ($) ft² $ / shares	Jul. 31, 2025 $ / shares shares	Jun. 30, 2026 USD ($) ft² $ / shares shares	Dec. 31, 2025 USD ($)	Sep. 30, 2024 ft²	Sep. 30, 2021 ft²	May 31, 2021 ft²
Related Party Transaction [Line Items]
Accrued liabilities and other current liabilities | $		$ 35,988		$ 35,988	$ 46,519
Subsequent Event | ICT License Acquisition
Related Party Transaction [Line Items]
Asset acquisition, contingent consideration, milestone achieved, shares issued | shares	1,100,000
South San Francisco, California
Related Party Transaction [Line Items]
Rentable area (in square feet) | ft²						12,150		11,000
SPA Put/Call Liability
Related Party Transaction [Line Items]
Sale of stock, sold and issued (in shares) | shares			3,753,752
Sale of stock, price per share (in dollars per share) | $ / shares			$ 13.32
Related Party
Related Party Transaction [Line Items]
Rentable area (in square feet) | ft²							18,000
Related Party | Subsequent Event | ICT License Acquisition
Related Party Transaction [Line Items]
Asset acquisition, contingent consideration, milestone achieved, shares issued | shares	1,100,000
Related Party | Sonoma
Related Party Transaction [Line Items]
Rentable area (in square feet) | ft²							18,000
Accrued liabilities and other current liabilities | $		$ 800		$ 800	$ 2,500
Related Party | Sonoma | South San Francisco, California
Related Party Transaction [Line Items]
Rentable area (in square feet) | ft²		3,600		3,600
Related Party | ARCH Venture Fund XIII | SPA Put/Call Liability
Related Party Transaction [Line Items]
Sale of stock, sold and issued (in shares) | shares				500,000
Proceeds from sale of stock | $				$ 12,500
Sale of stock, price per share (in dollars per share) | $ / shares		$ 25.61		$ 25.61
Beneficial ownership of investor after transaction (as a percent)			10.00%
Related Party | Innovative Cellular Therapeutics Holdings Limited and Innovative Cellular Therapeutics, Inc
Related Party Transaction [Line Items]
Related party, beneficial ownership percentage		10.00%