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Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Guarantees [Abstract]    
Balance at beginning of period $ 653 $ 308
Expense for product warranties 91 97
Product warranty claims paid (112) (32)
Balance at end of period $ 632 $ 373