Liquidity and management's plans (Details Textual) - USD ($)			1 Months Ended		3 Months Ended			6 Months Ended	12 Months Ended
	Jul. 14, 2015	May. 08, 2015	May. 31, 2016	May. 31, 2015	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015
Conversion of Stock [Line Items]
Proceeds from Notes Payable					$ 0		$ 500,000
Units Of Stock And Warrants Issued During Period Shares Initial Public Offering		2,850,000
Stock And Warrants Issued During Period Shares Initial Public Offering Purchase Price Per Unit		$ 6.00
Proceeds From Issuance Of Units Under Initial Public Offering Net		$ 12,100,000
Proceeds from Issuance Initial Public Offering		$ 17,100,000			$ 0		(252,715)
Common Stock
Conversion of Stock [Line Items]
Warrants Issued During Period On Exercise Of Over Allotment Option Shares		422,500
Shares Issued, Price Per Share		$ 6.00
Common Stock | Merck Global Health Innovation Fund LLC
Conversion of Stock [Line Items]
Proceeds From Issuance Of Shares And Debt	$ 6,000,000
Stock Issued During Period, Shares, New Issues	1,136,364
Shares Issued, Price Per Share	$ 4.40
Initial public offering
Conversion of Stock [Line Items]
Conversion of Stock, Shares Issued		7,374,852
Debt Conversion, Converted Instrument, Amount		$ 2,100,000
Debt Conversion, Converted Instrument, Shares Issued		350,000		1,875,000
Proceeds from Issuance Initial Public Offering		$ 12,100,000
Initial public offering | Common Stock
Conversion of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued				350,000
Convertible Notes Payable
Conversion of Stock [Line Items]
Proceeds from Convertible Debt									$ 1,500,000
Short-term Demand Notes
Conversion of Stock [Line Items]
Proceeds from Notes Payable								$ 2,300,000	$ 800,000
Repayments of Notes Payable						$ 200,000
Debt Conversion, Converted Instrument, Amount							$ 300,000
Promissory Note | Common Stock | Merck Global Health Innovation Fund LLC
Conversion of Stock [Line Items]
Debt Instrument, Face Amount	$ 1,000,000
Proceeds From Issuance Of Common Stock And Notes Payable	$ 6,000,000
Subsequent Event
Conversion of Stock [Line Items]
Proceeds from Issuance of Private Placement			$ 10,400,000
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.75