Quarterly report pursuant to Section 13 or 15(d)

Warrant Liability (Details)

v2.4.0.6
Warrant Liability (Details) (Series A Warrants [Member], USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Series A Warrants [Member]
   
Assumptions used to value the Series A warrants    
Expected price volatility 85.00% 80.00%
Expected term (in years) 5 years 11 days 5 years 3 months 7 days
Risk-free interest rate 0.78% 0.78%
Dividend yield 0.00% 0.00%
Weighted-average fair value of warrants $ 1.22 $ 0.69