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Warrant Liability (Tables)
 6 Months Ended
Jun. 30, 2014
Warrant Liability [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]
The inputs to the model were as follows:
 
 
 
June 30, 2014
 
 
December 31, 2013
 
 
 
 
 
 
 
 
 
 
Stock Price
 
$
12.08
 
 
$
8.55
 
Dividend Yield
 
 
N/A
 
 
 
N/A
 
Risk-free rate
 
 
0.47
%
 
 
0.78
%
Expected Term
 
 
2.47
 
 
 
2.97
 
Expected Volatility
 
 
35.98
%
 
 
44.69
%
Schedule Of Fair value Of Warrant Liability [Table Text Block]
The table below provides a reconciliation of the beginning and ending balances for the warrant liability measured using significant unobservable inputs (Level 3):
 
Balance - December 31, 2013
 
$
18,280
 
Warrants exercised for the six months ended June 30, 2014
 
 
(60)
 
Fair value adjustment for six months ended June 30, 2014
 
 
13,525
 
Balance at June 30, 2014
 
$
31,745