Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Net operating loss carryforwards	$ 27,812	$ 22,472
Research and development credits	10,950	8,144
Stock-based compensation	10,534	9,158
Deferred revenue	1,527	1,517
Lease liability	4,985	5,313
Tenant incentive	1,359	1,528
Accruals and other	1,912	2,092
Deferred tax liabilities:
ROU asset	(2,976)	(3,187)
Depreciation	(1,234)	(1,396)
Gross deferred tax assets and liabilities	54,869	45,641
Valuation allowance	(54,869)	$ (45,641)
Net operating loss carry forward subject to expiration, Federal	$ 32,700