Income Taxes- Summary of Income Tax Expense by Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Loss before income taxes:
Bermuda	$ (5,216)	$ (6,206)
Total loss before income taxes	(72,190)	(128,932)
Current taxes:
Bermuda	0	0
Total current tax expense	438	133
Deferred taxes:
Bermuda	0	0
Total deferred tax expense	0	0
Total income tax expense	438	133
United States
Loss before income taxes:
Foreign	(4,403)	(11,345)
Current taxes:
Foreign	403	123
Deferred taxes:
Foreign	0	0
Switzerland
Loss before income taxes:
Foreign	(62,520)	(111,383)
Current taxes:
Foreign	0	0
Deferred taxes:
Foreign	0	0
Other
Loss before income taxes:
Foreign	(51)	2
Current taxes:
Foreign	35	10
Deferred taxes:
Foreign	$ 0	$ 0