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Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Guarantees [Abstract]        
Balance at beginning of period $ 632 $ 373 $ 653 $ 308
Expense for product warranties 22 40 113 137
Product warranty claims paid (150) (66) (262) (98)
Balance at end of period $ 504 $ 347 $ 504 $ 347