Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Operating Loss Carryforwards [Line Items]
Effective income tax rate (as a percent)	(2.51%)	(0.13%)	(0.26%)
Deferred tax assets valuation allowance	$ 244,188,000	$ 207,858,000
Total change in valuation allowance	36,300,000
Change in unrecognized tax benefits	800,000	1,200,000
Unrecognized tax benefit	5,219,000	4,404,000	$ 3,177,000	$ 0
Significant change in unrecognized tax benefits over the next twelve months	0
Unrecognized tax benefit, accrual for interest and penalties	0	0
Deferred employer payroll taxes	900,000	1,800,000
Accrued Expenses and Other Current Liabilities
Operating Loss Carryforwards [Line Items]
Deferred employer payroll taxes		$ 900,000
Other Liabilities
Operating Loss Carryforwards [Line Items]
Deferred employer payroll taxes	900,000
Switzerland
Operating Loss Carryforwards [Line Items]
Net operating losses	987,100,000
United Kingdom
Operating Loss Carryforwards [Line Items]
Net operating losses	39,900,000
Ireland
Operating Loss Carryforwards [Line Items]
Net operating losses	100,000
United States | Research and Development Credit Carryforward
Operating Loss Carryforwards [Line Items]
Credit carryforwards	5,900,000
California | Research and Development Credit Carryforward
Operating Loss Carryforwards [Line Items]
Credit carryforwards	$ 6,100,000