Income Taxes - Carryforwards (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 74,371	$ 51,902
U.S. federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	72,100
Capital loss carryforwards	101,400
Income tax credit carryforwards	500
U.S. state
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	17,000
Net operating loss carryforwards	62,600
Income tax credit carryforwards	400
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Valuation allowance	22,500
Domestic Tax Authority | Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Valuation allowance	73,400
Foreign Tax Authority | Loss and Other Credit Carryforward
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 1,000