Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Research and development	$ 101,200	$ 75,473
Interest income, net	(6,337)	(7,180)
Net loss	(120,613)	(87,150)
Share based compensation expense under Company's equity incentive plans	18,395	13,443
Research and development expenses
Segment Reporting Information [Line Items]
Share based compensation expense under Company's equity incentive plans	7,865	7,185
General and administrative expenses
Segment Reporting Information [Line Items]
Share based compensation expense under Company's equity incentive plans	10,530	6,258
Reportable Segment
Segment Reporting Information [Line Items]
Personnel-related general and administrative	17,832	10,696
Other general and administrative	8,192	8,112
Interest income, net	(6,337)	(7,180)
Other segment items	(274)	49
Net loss	120,613	87,150
Reportable Segment \| Research and development expenses
Segment Reporting Information [Line Items]
Share based compensation expense under Company's equity incentive plans	7,865	7,185
Reportable Segment \| General and administrative expenses
Segment Reporting Information [Line Items]
Share based compensation expense under Company's equity incentive plans	10,645	6,270
Endocrine diseases \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	19,329	15,913
Neurological diseases \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	20,937	18,479
Rheumatology diseases \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	8,209	0
Dermatology diseases \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	5,145	0
Other clinical and nonclinical \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	2,392	6,401
Other unallocated research and development \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	10,685	10,160
Personnel-related research and development \| Reportable Segment
Segment Reporting Information [Line Items]
Research and development	$ 34,503	$ 24,520

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

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