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Inventory - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]        
Provision for excess and obsolete inventory $ 200 $ 100 $ 686 $ 415