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Stockholders' equity (Details Textual) - USD ($)			1 Months Ended			3 Months Ended
Stockholders' equity (Details Textual) - USD ($)	Jul. 14, 2015	May. 08, 2015	May. 31, 2015	Oct. 24, 2014	Mar. 31, 2014	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense						$ 261,497		$ 590,603
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						30,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price						$ 1.53
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, Shares Authorized						200,000,000	200,000,000
Common Stock, Shares, Issued						12,576,306	12,547,644
Preferred Stock, Shares Authorized						10,000,000	10,000,000	10,000,000
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
IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Debt Conversion, Converted Instrument, Amount		$ 2,100,000
Debt Conversion, Converted Instrument, Shares Issued		350,000	1,875,000
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
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						748,479
Share-based Compensation Arrangement by Share-based Payment Award, Common stock Percentage						4.00%
2015 Plan \| January 1, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						501,907
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value						$ 0.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number						2,119,140
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		75,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 1.70
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
Warrants Issued During Period On Exercise Of Over Allotment Option Shares		422,500
Proceeds from Issuance of Warrants		$ 4,225
Convertible Preferred Stock, Shares Issued upon Conversion		7,374,852
Shares Of Stock Issued For Restricted Stock Unit Exercises				130,640
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, Shares, New Issues	1,136,364
Offering Price Per Unit	$ 4.40
Proceeds from Issuance of Common Stock	$ 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
Common Stock [Member] \| IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Debt Conversion, Converted Instrument, Shares Issued			350,000