Stock-Based Compensation (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 1.48
Range of Exercise Prices, Upper Range Limit	$ 11.11
Options Exercisable Number Exercisable	1,435,314
Range One [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 0.01
Range of Exercise Prices, Upper Range Limit	$ 3.00
Options Outstanding Number Outstanding	229,351
Options Outstanding Weighted-Average Remaining Contractual Life	9 years 6 months 0 days
Options Outstanding Weighted Average Exercise Price	$ 2.20
Options Exercisable Number Exercisable	67,151
Options Exercisable Weighted-Average Exercise Price	$ 2.30
Range Two [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 3.01
Range of Exercise Prices, Upper Range Limit	$ 6.00
Options Outstanding Number Outstanding	910,763
Options Outstanding Weighted-Average Remaining Contractual Life	8 years 7 months 6 days
Options Outstanding Weighted Average Exercise Price	$ 3.49
Options Exercisable Number Exercisable	532,088
Options Exercisable Weighted-Average Exercise Price	$ 3.43
Range Three [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 6.01
Range of Exercise Prices, Upper Range Limit	$ 11.11
Options Outstanding Number Outstanding	295,200
Options Outstanding Weighted-Average Remaining Contractual Life	4 years 6 months 0 days
Options Outstanding Weighted Average Exercise Price	$ 7.52
Options Exercisable Number Exercisable	161,050
Options Exercisable Weighted-Average Exercise Price	$ 8.11
Net Range [Member]
Schedule of stock options outstanding
Range of Exercise Prices, Lower Range Limit	$ 0.01
Range of Exercise Prices, Upper Range Limit	$ 11.11
Options Outstanding Number Outstanding	1,435,314
Options Outstanding Weighted-Average Remaining Contractual Life	7 years 10 months 24 days
Options Outstanding Weighted Average Exercise Price	$ 4.11
Options Exercisable Number Exercisable	760,289
Options Exercisable Weighted-Average Exercise Price	$ 4.32