Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities
Net loss	$ (71,691)	$ (86,431)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,611	9,542
Stock-based compensation	14,535	20,611
Accretion and amortization of premiums and discounts on investments, net	(1,915)	(5,354)
Deferred revenue	(393)	(685)
Change in fair value of stock price appreciation milestones	(207)	(162)
Loss on disposal of property and equipment	(36)	0
Changes in operating assets and liabilities:
Accounts receivable	2,144	778
Prepaid expenses and other assets	3,139	1,078
Accounts payable and accrued expenses	(9,342)	(4,187)
Right-of-use assets and lease liabilities, net	(1,241)	(846)
Net cash used in operating activities	(58,396)	(65,656)
Investing activities
Proceeds from sale of property and equipment	122
Purchases of property and equipment	(2,558)	(137)
Purchases of investments	(99,437)	(215,001)
Maturities of investments	164,137	179,079
Net cash provided by investing activities	62,264	(36,059)
Financing activities
Issuance of common stock from equity incentive plans, net of issuance costs	0	295
Proceeds from public offering of common stock, net of issuance costs	0	74,531
Proceeds from issuance of pre-funded warrants, net of issuance costs	0	19,996
Proceeds from FT819 CIRM award	0	1,940
Proceeds from FT836 CIRM award	1,325	0
Net cash provided by financing activities	1,325	96,762
Net change in cash, cash equivalents and restricted cash	5,193	(4,953)
Cash, cash equivalents and restricted cash at beginning of the period	46,283	57,047
Cash, cash equivalents and restricted cash at end of the period	51,476	52,094
Supplemental schedule of noncash investing and financing activities
Purchases of property and equipment in accounts payable	$ 993	$ 102