Inventories - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Write-down of inventory	$ 404	$ 576	$ 1,356	$ 1,135