Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of (Loss) Income Before (Benefit) Provision for Income Taxes (Detail)

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Income Taxes - Components of (Loss) Income Before (Benefit) Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Taxes [Line Items]      
Income before income taxes, total $ (12,854) $ 7,049 $ 8,730
U.S. [Member]      
Income Taxes [Line Items]      
Income before income taxes, total (12,861) 7,346 8,301
China [Member]      
Income Taxes [Line Items]      
Income before income taxes, total $ 7 $ (297) $ 429