Stock-Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 1.00
Range of Exercise Prices, Upper Range Limit	$ 11.11
Options Exercisable Number Exercisable	2,426,533
Range One [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Upper Range Limit	$ 1.00
Options Outstanding Number Outstanding	37,156
Options Outstanding Weighted-Average Remaining Contractual Life	0 years
Options Outstanding Weighted Average Exercise Price	$ 1.00
Options Exercisable Number Exercisable	37,156
Options Exercisable Weighted-Average Exercise Price	$ 1.00
Range Two [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 1.01
Range of Exercise Prices, Upper Range Limit	$ 4.50
Options Outstanding Number Outstanding	1,968,902
Options Outstanding Weighted-Average Remaining Contractual Life	7 years 4 months 24 days
Options Outstanding Weighted Average Exercise Price	$ 3.47
Options Exercisable Number Exercisable	1,413,839
Options Exercisable Weighted-Average Exercise Price	$ 3.60
Range Three [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 4.51
Range of Exercise Prices, Upper Range Limit	$ 11.11
Options Outstanding Number Outstanding	420,475
Options Outstanding Weighted-Average Remaining Contractual Life	5 years 9 months 18 days
Options Outstanding Weighted Average Exercise Price	$ 6.83
Options Exercisable Number Exercisable	169,325
Options Exercisable Weighted-Average Exercise Price	$ 7.90
Net Range [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 1.00
Range of Exercise Prices, Upper Range Limit	$ 11.11
Options Outstanding Number Outstanding	2,426,533
Options Outstanding Weighted-Average Remaining Contractual Life	7 years
Options Outstanding Weighted Average Exercise Price	$ 4.01
Options Exercisable Number Exercisable	1,620,320
Options Exercisable Weighted-Average Exercise Price	$ 3.99