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Series A redeemable convertible preferred stock (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
May. 08, 2015
Apr. 30, 2014
Feb. 28, 2014
Dec. 31, 2013
Sep. 30, 2015
Dec. 31, 2014
Class of Stock [Line Items]            
Debt Conversion, Original Debt, Amount $ 2,100,000          
Conversion of Stock, Shares Issued 7,374,852          
Series A Preferred Stock            
Class of Stock [Line Items]            
Temporary Equity, Shares Issued   594,904 1,405,096 1,999,864    
Temporary Equity, Par or Stated Value Per Share       $ 1.00    
Debt Conversion, Original Debt, Amount       $ 1,999,864    
Proceeds from Issuance of Convertible Preferred Stock   $ 594,904 $ 1,405,096      
Temporary Equity, Shares Outstanding           3,999,864
Temporary Equity Shares Outstanding Convertible Into Common Stock Number           3,999,864
Preferred Stock, Dividend Rate, Percentage         8.00%  
Temporary Equity Liquidation And Redemption Preference Multiple Of Purchase Price         2  
Conversion of Stock, Shares Issued         1  
Temporary Equity Redemption Request Of Minimum Percentage Of Holders Of Outstanding Preferred Stock Required         70.00%  
Temporary Equity Redemption Number Of Installments         3  
Debt Conversion, Converted Instrument, Shares Issued         7,374,852