Nature of Business and Summary of Significant Accounting Policies (Details 6) (Level 2 [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Liabilities [Member]
Reconciliation of beginning and ending balances of assets and liabilities measured at fair value using significant observable inputs
Increase and Decrease in fair value of warrants	$ 5,255,912	$ (4,834,397)
Warrant liability as of January 1	279,302	4,989,994
Number of warrant liability as of January 1	3,246,301	4,322,421
Increase of fair value of warrants due to ratcheting strike price down to $3.12 from $4.67 as a result of private placement offering		460,452
Increase in number of warrants
Decrease due to exercise of warrants	1,037,237	(336,747)
Decrease due to exercise of CDC warrants	(236,865)	(601,120)
Expiration of warrants
Number of expiration of warrants	(1,000,000)	(475,000)
Warrant liability as of December 31	4,497,977	279,302
Number of Warrant liability as of December 31	2,009,436	3,246,301
Assets [Member]
Reconciliation of beginning and ending balances of assets and liabilities measured at fair value using significant observable inputs
Warrant asset as of January 1	388,540	1,299,031
Number of warrant assets as of January 1	2,000,000	2,000,000
Increase and Decrease in fair value of warrants	(338,240)	(910,491)
Warrant asset as of December 31	$ 50,300	$ 388,540
Number of Warrant asset as of December 31	2,000,000	2,000,000