Stockholders' Equity (Details 1) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Summary of stock options activity
Granted, Number of Options	0	0
Balance at September 30, 2012	1,300,000	1,300,000
Stock Options [Member]
Summary of stock options activity
Balance at December 31, 2011		7,576,493
Granted, Number of Options
Exercised, Number of options		(443,136)
Expired/terminated, Number of options		(370,285)
Balance at September 30, 2012	6,763,072	6,763,072
Weighted Average Exercise Price, Beginning Balance		5.75
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised		4.71
Weighted Average Exercise Price, Expired/Terminated		7.91
Weighted Average Exercise Price, Ending balance	5.92	5.92
Balance at September 30, 2012, Weighted Average Remaining Contractual Life (years)		5 years 2 months 9 days
Aggregate Intrinsic Value	6,778,568	6,778,568
Exercisable at September 30, 2012, Number of options	5,591,287	5,591,287
Exercisable at September 30, 2012, Weighted Average Exercise Price	6.17	6.17
Exercisable at September 30, 2012, Weighted Average Remaining Contractual Life (years)		4 years 8 months 9 days
Exercisable at September 30, 2012, Aggregate Intrinsic Value	5,258,785	5,258,785
Expected to vest after September 30, 2012, Number of options	818,240	818,240
Expected to vest after September 30, 2012, Weighted Average Exercise Price	4.64	4.64
Expected to vest after September 30, 2012, Weighted Average Remaining Contractual Life (years)		7 years 9 months 4 days
Expected to vest after September 30, 2012, Aggregate Intrinsic Value	1,139,383	1,139,383