Income Taxes Income Taxes - Reconciliation of Income Tax Benefit to Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019
$
Income tax benefit at Bermuda statutory rate	$ 0	$ 0
Foreign rate differential	(15,415)	(14,653)
Valuation allowance	16,759	29,962
Research and development credit	(621)	(1,437)
Research and development true-up	(285)	318
Switzerland rate change	0	(14,057)
Total income tax expense	$ 438	$ 133
%
Income tax benefit at Bermuda statutory rate	0.00%	0.00%
Foreign rate differential	21.35%	11.37%
Valuation allowance	(23.21%)	(23.24%)
Research and development credit	0.86%	1.12%
Research and development true-up	0.39%	(0.25%)
Switzerland rate change	0.00%	10.90%
Total income tax expense	(0.61%)	(0.10%)

Effective Income Tax Rate Reconciliation, Tax Credit, Research True-up, Amount

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