Stock Based Compensation (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2012
Range One [Member]
Schedule of stock option plans quantitative information
Range of Exercise Prices, Lower Range Limit	$ 0.01
Range of Exercise Prices, Upper Range Limit	$ 1.00
Number Outstanding	43,329
Options Outstanding Weighted-Average Remaining Contractual Life	7 months 6 days
Options Outstanding Weighted Average Exercise Price	$ 1.00
Options Exercisable Number Exercisable	43,329
Options Exercisable Weighted-Average Exercise Price	$ 1.00
Range Two [Member]
Schedule of stock option plans quantitative information
Range of Exercise Prices, Lower Range Limit	$ 1.01
Range of Exercise Prices, Upper Range Limit	$ 4.50
Number Outstanding	1,696,502
Options Outstanding Weighted-Average Remaining Contractual Life	7 years 4 months 24 days
Options Outstanding Weighted Average Exercise Price	$ 3.58
Options Exercisable Number Exercisable	1,346,152
Options Exercisable Weighted-Average Exercise Price	$ 3.63
Range Three [Member]
Schedule of stock option plans quantitative information
Range of Exercise Prices, Lower Range Limit	$ 4.51
Range of Exercise Prices, Upper Range Limit	$ 11.11
Number Outstanding	455,475
Options Outstanding Weighted-Average Remaining Contractual Life	6 years 2 months 12 days
Options Outstanding Weighted Average Exercise Price	$ 6.70
Options Exercisable Number Exercisable	173,200
Options Exercisable Weighted-Average Exercise Price	$ 7.73
Net Range [Member]
Schedule of stock option plans quantitative information
Range of Exercise Prices, Lower Range Limit	$ 0.01
Range of Exercise Prices, Upper Range Limit	$ 11.11
Number Outstanding	2,195,306
Options Outstanding Weighted-Average Remaining Contractual Life	7 years
Options Outstanding Weighted Average Exercise Price	$ 4.18
Options Exercisable Number Exercisable	1,562,681
Options Exercisable Weighted-Average Exercise Price	$ 4.01