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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Tax Credit Carryforward [Line Items]
Increase in valuation allowance	$ 17,200	$ 1,300
Deferred tax assets, taxable income limitation	80.00%
Capitalized research and development costs	$ 38,100
Unrecognized tax benefits	2,399	4,931	$ 1,283
Unrecognized tax benefits that would impact effective tax rate	0	0
Interest or penalties related to unrecognized tax benefits	0	0
Research and development
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	2,400	$ 4,900
U.S. federal
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	229,200
Operating loss carryforwards, subject to expiration	82,100
Operating loss carryforwards, not subject to expiration	147,100
U.S. federal \| Research and development
Tax Credit Carryforward [Line Items]
Tax credit carryforward	7,600
State
Tax Credit Carryforward [Line Items]
Operating loss carryforwards, subject to expiration	66,600
State \| Research and development
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 2,000