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Redeemable Convertible Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2014
Temporary Equity Disclosure [Abstract]  
Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]
The table below shows the quantitative information about the significant unobservable inputs used in the fair value measurement of level 3 conversion feature liability at December 31, 2014 and 2013:
 
 
 
2014
 
2013
 
Expected life of the redemption in years
 
1.0
 
1.0
 
Risk free interest rate
 
0.25
%
0.13
%
Expected annual volatility
 
76.42
%
83.93
%
Annual rate of dividends
 
0
%
0
%
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
The changes in the fair value of the derivative are as follows:
 
Balance as of January 1, 2013
 
$
108,839
 
Decrease of fair value
 
 
32,603
 
 
 
 
 
 
Ending balance as of December 31, 2013
 
 
76,236
 
Decrease of fair value
 
 
5,450
 
 
 
 
 
 
Ending balance as of December 31, 2014
 
$
70,786