Stockholders' Equity - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 14,976	$ 10,523	$ 28,057	$ 23,543
Research and development	152,169	99,236	253,175	205,683
General and administrative	29,492	16,555	53,763	32,480
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Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	7,190	4,877	13,372	9,706
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Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 7,786	$ 5,646	$ 14,685	$ 13,837

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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