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Inventory - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]        
Provision for excess and obsolete inventory $ 400 $ 100 $ 514 $ 351