Earnings Per Share (Details 1)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of dilutive potential common shares	41,649,144		11,649,903
Stock options outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of dilutive potential common shares	1,986,255		1,948,124
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of dilutive potential common shares			280,771
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of dilutive potential common shares	39,662,889	[1]	9,421,008	[1]

[1] On May 31, 2011, the Company issued 7,128,563 warrants as part of an underwritten public offering. As a result of the March 28 and 29, 2012 and February 20 and 21, 2013 public offerings described in Note 5, the number of warrants increased to 18,925,389. Additionally, on February 20, 2013 the Company issued 23,637,500 warrants as part of an underwritten public offering. Of the warrants issued in February 2013, 2,900,000 were exercised as of March 31, 2013.