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Warrant Liability (Tables)
 6 Months Ended
Jun. 30, 2012
Warrant Liability [Abstract]  
Schedule of assumptions used to determine fair value of warrants [Table Text Block]
All future changes in the fair value of the warrants will be recognized currently in earnings until such time as the warrants are exercised or expire. These warrants are not traded in an active securities market, and as such, we estimated the fair value of these warrants using an option pricing model with the following assumptions:

As of
June 30, 2012
As of
December 31, 2011
Expected term
1.12 years
1.61 years
Common stock market price
$
2.70
$
2.20
Risk-free interest rate
0.21
%
0.19
%
Expected volatility
77.29
%
69.98
%
Resulting fair value (per warrant)
$
0.50
$
0.32