Loss Per Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of common stock warrant and common stock options exercised	3,206,230	161,264	4,933,976	750,162
Number of common stock issued for stock warrant and stock options exercised		160,411	4,818,462	748,783
Shares surrendered in lieu of cash payment		853	115,514	1,379
Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares	35,157,966	26,022,072	31,659,650	26,836,546