Income Taxes - Schedule of Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Taxes at the U.S. statutory tax rate of 21%	$ (107,612)	$ (88,531)	$ (30,490)
State income taxes, net of federal tax benefit	1,516	0	0
Foreign tax effects	51	15	27
Effective of cross-border tax laws	80	70	908
Change in valuation allowance	124,243	106,498	37,886
Research Tax Credit	(21,990)	(24,660)	(23,011)
Effect of changes in tax laws or rates enacted in the current period	0	0	0
Stock-based compensation	6,286	9,579	5,777
Nondeductible acquisition - related costs	0	0	5,040
Other nontaxable or nondeductible items	261	(2,930)	220
Changes in UTB	(1,573)	173	401
Other	(1,160)	(146)	3,273
Total provision for income taxes	$ 102	$ 68	$ 30
Rate
Taxes at the U.S. statutory tax rate of 21%	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	(0.30%)	0.00%	0.00%
Foreign tax effects	0.00%	0.00%	0.00%
Effective of cross-border tax laws	0.00%	0.00%	(0.60%)
Change in valuation allowance	(24.20%)	(25.30%)	(26.10%)
Research Tax Credit	4.30%	5.90%	15.90%
Effect of changes in tax laws or rates enacted in the current period	0.00%	0.00%	0.00%
Stock-based compensation	(1.20%)	(2.30%)	(4.00%)
Nondeductible acquisition - related costs	0.00%	0.00%	(3.50%)
Other nontaxable or nondeductible items	(0.10%)	0.70%	(0.20%)
Changes in UTB	0.30%	0.00%	(0.30%)
Other	0.20%	0.00%	(2.30%)
Total provision for income taxes	0.00%	0.00%	0.00%