Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Provision (Benefit) for Income Taxes (Detail)

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Income Taxes - Schedule of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]      
Current U.S. federal $ 0 $ 0 $ 0
Current state and local 0 17 0
Current non-U.S. (116) (24) 270
Total current (116) (7) 270
Deferred U.S. federal 0 0 0
Deferred state and local 0 0 0
Deferred non-U.S. (835) (137) (56)
Total deferred (835) (137) (56)
Total income tax provision $ (951) $ (144) $ 214