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Stockholders' equity (deficit) (Details Textual) - USD ($)			1 Months Ended			3 Months Ended			9 Months Ended
	Jul. 14, 2015	May. 08, 2015	Jul. 31, 2015	Oct. 24, 2014	Mar. 31, 2014	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense						$ 261,540		$ 24,977	$ 1,172,231	$ 80,457
Debt Conversion, Converted Instrument, Amount									300,000	0
Stock Purchase Warrants Issued Upon Conversion Over Allotment Option		422,500
Proceeds from Issuance of Warrants		$ 4,225
Proceeds From Issuance Of Units Under Initial Public Offering Gross		17,100,000
Proceeds From Issuance Of Units Under Initial Public Offering Net		$ 12,100,000
Stock Issued During Period, Value, Acquisitions									$ 2,584,090	0
Merck Global Health Innovation Fund LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues			1,136,364
Over-Allotment Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		3,272,500
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 6.60
Expiration Date of Warrants Issued		May 08, 2020
Demand Notes Payable [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Debt Conversion, Converted Instrument, Amount		$ 2,100,000
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						1,355,000			1,355,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						528,890			528,890
Share-based Compensation Arrangement by Share-based Payment Award, Common stock Pecentage									4.00%
Stock Purchase Warrants Issued							3,457,750
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense						$ 261,540		$ 24,977	$ 1,172,231	$ 80,457
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross									1,660,387
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price									$ 2.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value									$ 3.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number						1,948,249			1,948,249
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					130,640
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				130,640
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of Warrant or Right, Outstanding						3,716,355			3,716,355			33,594
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock and Warrants Issued in Conjunction with Initial Public Offering		2,850,000
Offering Price Per Unit		$ 6.00
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		$ 2,900,000
Convertible Preferred Stock, Shares Issued upon Conversion		7,374,852					7,374,852
Class of Warrant or Right, Number of Securities Called by Warrants or Rights											225,011
Proceeds From Issuance Of Units Under Initial Public Offering Gross		$ 17,100,000
Proceeds From Issuance Of Units Under Initial Public Offering Net		$ 12,100,000
Common Stock [Member] \| Merck Global Health Innovation Fund LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, Acquisitions	$ 5,000,000
Common Stock [Member] \| Over-Allotment Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		185,250