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Property and equipment (Detail) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross   $ 1,763,976 $ 1,945,932
Less accumulated depreciation and amortization   (558,837) (697,959)
Property and equipment, net $ 1,167,680 1,205,139 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   287,570 166,043
Software      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross   70,971 215,439
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross   141,977 351,090
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross   183,130 114,127
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross   $ 1,075,760 $ 1,094,665