Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 1,910	$ 1,708
Finished goods	35,307	35,036
Inventory, gross	37,217	36,744
Excess and obsolete inventory reserves	(10,378)	(11,362)
Inventories, net	$ 26,839	$ 25,382