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Redeemable Convertible Preferred Stock (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
EUR (€)
shares
Sep. 30, 2015
USD ($)
shares
May. 13, 2015
shares
Feb. 28, 2014
$ / shares
Dec. 31, 2013
shares
Redeemable Convertible Preferred Stock                
Liquidation preference     $ 6,777,338   $ 0      
Carrying value     7,304,914          
Issuance costs incurred $ 417,775 $ 1,954,007 $ 2,480,049          
Original issue price (in dollars per share) | $ / shares     $ 2.2472          
Recorded cumulative deemed dividends     $ 610,889          
Conversion Price (in dollars per share) | $ / shares     $ 2.2472          
Conversion ratio | shares     1          
Maximum period between the initial preferred stock closing and IPO at a price per share at least three times the original issue price that triggers conversion of preferred stock     6 months          
Minimum initial public offering price as a percentage to the original issue price of preferred stock when an IPO closes within six months of the issuance of preferred stock that triggers conversion of preferred stock     33.30%          
Minimum period between the initial preferred stock closing and IPO at a price per share at least five times the original issue price that triggers conversion of preferred stock     6 months          
Minimum initial public offering price as a percentage to the original issue price of preferred stock when an IPO closes after six months of the issuance of preferred stock that triggers conversion of preferred stock     20.00%          
Minimum gross proceeds from the initial public offering that triggers automatic conversion of preferred stock     $ 25,000,000          
Additions to redemption price in lieu of accruing dividends as a percentage of preferred stock original issue price per share for each 12 month period after the date of initial closing     10.00%          
Maximum number of days after receipt of written notice requesting redemption     P60D          
Series A redeemable convertible preferred stock                
Redeemable Convertible Preferred Stock                
Preferred shares authorized | shares     3,017,488 0 0     0
Preferred shares issued | shares     3,015,902          
Preferred shares outstanding | shares     3,015,902 0 0 0    
Redemption value     $ 9,020,637          
Liquidation preference     6,777,338          
Carrying value     7,304,914 € 0        
Issuance costs incurred     119,097          
Accretion of issuance costs $ 83,314   $ 35,784          
Preferred stock dividend rate (as a percent)     8.00%          
Original issue price (in dollars per share) | $ / shares     $ 2.2472       $ 2.2472  
Dividends in arrears     $ 440,258