Liquidity and management's plans (Details Textual) - Debt Instrument, Name [Domain] - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 14, 2015	May. 08, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Jul. 13, 2015	Apr. 30, 2015
Conversion of Stock [Line Items]
Proceeds from Issuance of Preferred Stock and Preference Stock					$ 0	$ 1,937,902
Proceeds from Notes Payable					750,000	$ 0
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 Gross		$ 17,100,000
Proceeds From Issuance Of Units Under Initial Public Offering Net		12,100,000
Debt Conversion, Original Debt, Amount		$ 2,100,000
Conversion of Stock, Shares Issued		7,374,852
Common Stock
Conversion of Stock [Line Items]
Stock And Warrants Issued During Period Shares Initial Public Offering		422,500
Initial public offering
Conversion of Stock [Line Items]
Proceeds From Issuance Of Units Under Initial Public Offering Net		$ 12,100,000
Convertible Notes Payable
Conversion of Stock [Line Items]
Proceeds from Other Short-term Debt					1,500,000		$ 1,500,000
Short-term Demand Notes
Conversion of Stock [Line Items]
Proceeds from Notes Payable			$ 2,300,000	$ 2,300,000	2,300,000		2,300,000
Repayments of Notes Payable			$ 300,000
Unsecured Promissory Note
Conversion of Stock [Line Items]
Proceeds from Notes Payable					$ 200,000
Promissory Note
Conversion of Stock [Line Items]
Debt Instrument, Face Amount										$ 150,000
Series A Preferred Stock
Conversion of Stock [Line Items]
Proceeds from Issuance of Preferred Stock and Preference Stock							$ 4,000,000	$ 4,000,000
Debt Conversion, Original Debt, Amount								$ 1,999,864
Conversion of Stock, Shares Issued					1
Subsequent Event | AdvanDx Inc [Member]
Conversion of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	681,818
Subsequent Event | Merck Global Health Innovation Fund LLC | AdvanDx Inc [Member]
Conversion of Stock [Line Items]
Proceeds From Issuance Of Shares And Debt	$ 6,000,000
Subsequent Event | Common Stock | AdvanDx Inc [Member]
Conversion of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	681,818
Business Acquisition, Share Price									$ 3.79
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 2,600,000
Subsequent Event | Common Stock | Merck Global Health Innovation Fund LLC
Conversion of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1,136,364
Business Acquisition, Share Price	$ 4.40
Stock Issued During Period, Shares, Acquisitions	1,136,364
Stock Issued During Period, Value, Acquisitions	$ 5,000,000
Subsequent Event | Promissory Note | Merck Global Health Innovation Fund LLC
Conversion of Stock [Line Items]
Debt Instrument, Face Amount	$ 1,000,000