Property and equipment (Detail) - USD ($)	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,945,932	$ 1,142,447
Less accumulated depreciation and amortization	(697,959)	(559,977)
Property and equipment, net	1,247,973	582,470
Website
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,568	4,568
Computers
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	166,043	125,478
Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	215,439	165,439
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	351,090	355,988
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	114,127	88,939
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,094,665	$ 402,035