Income Taxes- Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Loss Carryforwards [Line Items]
Effective income tax rate	(0.36%)	0.65%
Income tax receivable	$ 1,609	$ 1,656
Valuation allowance on deferred tax assets	201,976	$ 183,703
Unrecognized tax benefits	0
Research and Development Tax Credit
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 12,200
Bermuda
Operating Loss Carryforwards [Line Items]
Effective income tax rate	(0.36%)	0.65%
United States
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 71,900
Switzerland
Operating Loss Carryforwards [Line Items]
Net operating losses	1,210,000
United Kingdom
Operating Loss Carryforwards [Line Items]
Net operating losses	167
Ireland
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 115