Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Guarantees [Abstract]        
Balance at beginning of period $ 492 $ 291 $ 493 $ 538
Expense (income) for product warranties (37) 78 11 (82)
Product warranty claims paid (106) (68) (155) (155)
Balance at end of period $ 349 $ 301 $ 349 $ 301