Stockholders' Equity (Details 4) (USD $)					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 $0.00 - 5.00 [Member]	Dec. 31, 2012 $0.00 - 5.00 [Member] Warrant [Member]
Summary of warrants outstanding to purchase common stock
Range of Exercise Prices, minimum					$ 0.00
Range of Exercise Prices, maximum					$ 5.00
Number Outstanding	4,279,919	4,553,251	4,311,539	3,662,133		2,009,436
Weighted Average Remaining Contractual Life (Years)						1 year 10 months 21 days
Weighted Average Exercise Price	$ 3.70	$ 3.66	$ 3.65	$ 3.78		$ 3.88
Aggregate Intrinsic Value	$ 4,572,205		$ 2,671,309			$ 1,428,672