Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator
Net loss	$ (10,325,464)	$ (6,290,546)	$ (23,388,120)	$ (20,286,414)
Denominator
Weighted average number of common shares outstanding (in shares)	37,977,052	22,676,114	33,107,175	17,441,767