Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash flows used in operating activities:
Net loss	$ (84,508)	$ (70,743)
Adjustments to reconcile net loss to cash used in operating activities:
Stock-based compensation expense	15,092	21,427
Impairment of long-lived assets	10,733	0
Depreciation and amortization expense	1,531	1,338
Reduction in carrying amount of right-of-use asset	5,005	4,790
Net accretion of discounts on marketable securities	(1,879)	(4,315)
Other	78	53
Changes in operating assets and liabilities:
Accounts receivable	(3,440)	1,458
Prepaid expenses and other current and long-term assets	3,402	(4,300)
Accounts payable	4	57
Accrued expenses and other current liabilities	(8,118)	(5,242)
Operating lease liability	(4,294)	(3,881)
Deferred revenue	(10,155)	12,133
Net cash used in operating activities	(76,549)	(47,225)
Cash flows provided by (used in) investing activities:
Proceeds from maturities of marketable securities	166,731	178,781
Purchases of marketable securities	(94,003)	(243,537)
Purchases of property and equipment, net	(596)	(184)
Net cash provided by (used in) investing activities	72,132	(64,940)
Cash flows provided by (used in) financing activities:
Proceeds from exercise of stock options	107	667
Payments for repurchase of common stock for tax withholding	(179)	(194)
Other	273	381
Net cash provided by financing activities	7,727	45,224
Net change in cash, cash equivalents and restricted cash	3,310	(66,941)
Cash, cash equivalents and restricted cash at beginning of period	58,942	130,033
Cash, cash equivalents and restricted cash at end of period	62,252	63,092
Reconciliation of cash, cash equivalents and restricted cash:
Cash, cash equivalents and restricted cash at end of period	62,252	63,092
Less: restricted cash	(3,443)	(3,443)
Cash and cash equivalents at end of the period	58,809	59,649
Supplemental disclosures of cash flow information:
Cash paid for leases	6,812	6,614
Supplemental disclosures of non-cash investing activities:
Capital expenditures in accounts payable and accrued expenses	25	0
At-The-Market
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock	7,526	24,370
Stock Purchase Agreement
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock	$ 0	$ 20,000