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Income Taxes - Schedule Components of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Current taxes:        
Total current tax expense     $ 1,686 $ 7,124
Deferred taxes:        
Total deferred tax benefit     0 0
Income tax provision $ 93 $ 1,221 1,686 7,124
United States [Member]        
Current taxes:        
Total current tax expense     1,365 6,327
Deferred taxes:        
Total deferred tax benefit     0 0
Switzerland [Member]        
Current taxes:        
Total current tax expense     0 0
Deferred taxes:        
Total deferred tax benefit     0 0
Bermuda [Member]        
Current taxes:        
Total current tax expense     0 0
Deferred taxes:        
Total deferred tax benefit     0 0
Other [Member]        
Current taxes:        
Total current tax expense [1]     321 797
Deferred taxes:        
Total deferred tax benefit     $ 0 $ 0
[1] Primarily Greater China, United States state and local and United Kingdom activity