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Product Warranty - Changes in Carrying Amount of Accrued Product Warranty Costs (Detail)
$ in Thousands
6 Months Ended
Sep. 30, 2015
USD ($)
Product Warranties Disclosures [Abstract]  
Balance, Beginning $ 337
Warranty costs incurred (104)
Change in estimates to pre-existing warranties (43)
Product warranty accrual 104
Balance, Ending $ 294