Annual report pursuant to Section 13 and 15(d)

Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail)

v3.8.0.1
Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Guarantees [Abstract]    
Balance at beginning of year $ 538 $ 686
Expense for product warranties 528 106
Product warranty claims paid (573) (254)
Balance at end of year $ 493 $ 538