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Warrant Liability (Tables)
 3 Months Ended
Mar. 31, 2013
Warrant Liability [Abstract]  
Assumptions Used to Determine Fair Value of Warrants
All future changes in the fair value of the warrants are recognized currently in earnings until such time as the warrants are exercised or expire in August 2013. 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
March 31, 2013
As of
December 31, 2012
Expected term
0.37 years
0.61 years
Common stock market price
$
2.51
$
2.80
Risk-free interest rate
0.09
%
0.11
%
Expected volatility
53.28
%
73.88
%
Resulting fair value (per warrant)
$
0.04
$
0.20