Property and equipment (Detail) - USD ($)	Jun. 30, 2016	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,109,443	$ 1,945,932
Less accumulated depreciation and amortization	(767,459)	(697,959)
Property and equipment, net	1,341,984	1,247,973
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	189,682	166,043
Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	290,439	215,439
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	389,330	351,090
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	118,027	114,127
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,117,397	$ 1,094,665