Stock Based Compensation (Details 4) (USD $)	9 Months Ended
	Sep. 30, 2013
$3.03 to $3.29
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 3.03
Range of Exercise Prices upper range limit (in dollars per share)	$ 3.29
Number of Options outstanding (in shares)	305,712
Weighted Average Remaining Contractual Term	8 years 2 months 5 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 3.04
Number of Options exercisable (in shares)	110,139
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 3.04
$3.40 to $3.40
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 3.40
Range of Exercise Prices upper range limit (in dollars per share)	$ 3.40
Number of Options outstanding (in shares)	708,314
Weighted Average Remaining Contractual Term	8 years 11 months 12 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 3.40
Number of Options exercisable (in shares)	177,079
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 3.40
$3.48 to $6.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 3.48
Range of Exercise Prices upper range limit (in dollars per share)	$ 6.65
Number of Options outstanding (in shares)	474,645
Weighted Average Remaining Contractual Term	8 years 5 months 1 day
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 5.59
Number of Options exercisable (in shares)	94,719
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 5.21
$6.70 to $6.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 6.70
Range of Exercise Prices upper range limit (in dollars per share)	$ 6.70
Number of Options outstanding (in shares)	20,000
Weighted Average Remaining Contractual Term	9 years 3 months 14 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 6.70
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 6.50
$6.90 to $6.90
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 6.90
Range of Exercise Prices upper range limit (in dollars per share)	$ 6.90
Number of Options outstanding (in shares)	384,700
Weighted Average Remaining Contractual Term	9 years 5 months 19 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 6.90
$6.96 to $7.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 6.96
Range of Exercise Prices upper range limit (in dollars per share)	$ 7.44
Number of Options outstanding (in shares)	109,500
Weighted Average Remaining Contractual Term	9 years 3 months 7 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 6.99
$7.45 to $7.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 7.45
Range of Exercise Prices upper range limit (in dollars per share)	$ 7.45
Number of Options outstanding (in shares)	375,000
Weighted Average Remaining Contractual Term	9 years 6 months
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 7.45
$8.30 to $11.46
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 8.30
Range of Exercise Prices upper range limit (in dollars per share)	$ 11.46
Number of Options outstanding (in shares)	312,950
Weighted Average Remaining Contractual Term	9 years 8 months 5 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 10.96
Number of Options exercisable (in shares)	5,250
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 8.30
$12.44 to $12.44
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 12.44
Range of Exercise Prices upper range limit (in dollars per share)	$ 12.44
Number of Options outstanding (in shares)	591,300
Weighted Average Remaining Contractual Term	9 years 7 months 20 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 12.44
$12.78 to $15.88
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of Exercise Prices lower range limit (in dollars per share)	$ 12.78
Range of Exercise Prices upper range limit (in dollars per share)	$ 15.88
Number of Options outstanding (in shares)	156,500
Weighted Average Remaining Contractual Term	9 years 9 months 22 days
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 13.98