Segment Reporting - Schedule of Disaggregated Segment Operating Expenses on Functional Basis (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting [Abstract]
Revenue	$ 4,121			$ 4,032			$ 12,377	$ 10,170
Cost of revenue	2,011			2,094			6,095	5,140
Gross profit	2,110			1,938			6,282	5,030
Operating expenses:
Compensation expenses	8,626			9,170			27,388	28,294
Stock-based compensation	3,593			6,523			12,128	21,767
Professional expenses	3,542			3,568			9,712	11,571
Business expenses	2,187			2,498			6,860	7,447
Facility expenses	1,532			1,650			4,588	4,874
Depreciation and amortization	1,209			1,476			3,960	4,370
Other	767			1,378			2,253	3,320
Total operating expenses	21,456			26,263			66,889	81,643
Interest income	2,765			4,082			8,974	13,101
Loss on equity method investment	(1,419)			(861)			(4,835)	(861)
Other expense	(210)			(224)			(965)	(484)
Provision for income taxes	24			0			173	0
Net loss	$ (18,234)	$ (19,424)	$ (19,948)	$ (21,328)	$ (22,850)	$ (20,679)	$ (57,606)	$ (64,857)