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, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]      
Current state and local $ 0 $ 0 $ 17
Current non-U.S. (63) (116) (24)
Total current (63) (116) (7)
Deferred non-U.S. 532 (835) (137)
Total deferred 532 (835) (137)
Total income tax provision $ 469 $ (951) $ (144)