Quarterly report pursuant to Section 13 or 15(d)

Loss Per Share (Details)

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Loss Per Share (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Loss Per Share (Textual) [Abstract]        
Potential common shares 29,701,838 27,416,029 29,910,492 27,243,783
Number of common stock warrant and common stock options exercised 216,053   1,727,746  
Number of common stock issued for stock warrant and stock options exercised     1,612,232  
Shares surrendered in lieu of cash payment     115,514