Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule of the components of the calculations of basic and diluted earnings per share

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Numerator:
	Net loss	$	(10,325,464)	$	(6,290,546)	$	(23,388,120)	$	(20,286,414)
Denominator:
	Weighted average number of common shares outstanding	37,977,052		22,676,114		33,107,175		17,441,767

Schedule of potential dilutive common shares

	At September 30,
	2012		2011
Stock options outstanding	1,999,521		1,344,665
Unvested restricted stock		275,262	408,388
Common stock warrants (1)	9,421,008		7,128,563
Number of dilutive potential common shares	11,695,791		8,881,616

⁽¹⁾ On May 31, 2011, the Company granted 7,128,563 warrants as part of an underwritten public offering. As a result of the March 28 and 29, 2012 public offerings described in Note 5, the number of warrants increased to 9,421,008.