Stockholders' Equity (Details 1) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Summary of stock options activity
Granted, Number of Units	0	0
Balance at June 30, 2012	1,400,000	1,400,000
Stock Options [Member]
Summary of stock options activity
Balance at December 31, 2011		7,576,493
Granted, Number of Units
Exercised, Number of options		(247,501)
Expired/terminated, Number of options		(320,786)
Balance at June 30, 2012	7,008,206	7,008,206
Weighted Average Exercise Price, Beginning Balance		5.75
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised		1.60
Weighted Average Exercise Price, Expired/Terminated		7.57
Weighted Average Exercise Price, Ending balance	5.81	5.81
Balance at June 30, 2012, Weighted Average Remaining Contractual Life (years)		5 years 4 months 6 days
Aggregate Intrinsic Value		4,343,755
Exercisable at June 30, 2012, Number of options	6,339,175	6,339,175
Exercisable at June 30, 2012, Weighted Average Exercise Price	6.01	6.01
Exercisable at June 30, 2012, Weighted Average Remaining Contractual Life (years)		4 years 9 months 7 days
Exercisable at June 30, 2012, Aggregate Intrinsic Value		3,634,350
Expected to vest after June 30, 2012, Number of options	628,889	628,889
Expected to vest after June 30, 2012, Weighted Average Exercise Price	4.72	4.72
Expected to vest after June 30, 2012, Weighted Average Remaining Contractual Life (years)		7 years 10 months 6 days
Expected to vest after June 30, 2012, Aggregate Intrinsic Value	709,405	709,405