Stock-Based Compensation (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	3,009,168
Options Outstanding, Weighted Average Exercise Price	$ 3.42
Options Outstanding, Weighted Average Remaining Contractual Term	7 years 6 months 25 days
Options Exercisable, Number of Options	1,736,997
Options Exercisable, Weighted Average Exercise Price	$ 1.20
Exercise Price Range, One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	95,000
Options Outstanding, Weighted Average Exercise Price	$ 0.78
Options Outstanding, Weighted Average Remaining Contractual Term	2 years 9 months 29 days
Options Exercisable, Number of Options	95,000
Options Exercisable, Weighted Average Exercise Price	$ 0.78
Exercise Price Range, One [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Weighted Average Exercise Price	$ 1.00
Options Exercisable, Weighted Average Exercise Price	$ 1.00
Exercise Price Range, One [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Weighted Average Exercise Price	$ 0.55
Options Exercisable, Weighted Average Exercise Price	$ 0.55
Exercise Price Range, Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	1,883,500
Options Outstanding, Weighted Average Exercise Price	$ 1.07
Options Outstanding, Weighted Average Remaining Contractual Term	6 years 10 months 20 days
Options Exercisable, Number of Options	1,446,664
Options Exercisable, Weighted Average Exercise Price	$ 1.08
Exercise Price Range, Two [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Weighted Average Exercise Price	$ 1.50
Options Exercisable, Weighted Average Exercise Price	$ 1.50
Exercise Price Range, Two [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Weighted Average Exercise Price	$ 1.01
Options Exercisable, Weighted Average Exercise Price	$ 1.01
Exercise Price Range, Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	1,030,668
Options Outstanding, Weighted Average Exercise Price	$ 7.96
Options Outstanding, Weighted Average Remaining Contractual Term	9 years 2 months 23 days
Options Exercisable, Number of Options	195,333
Options Exercisable, Weighted Average Exercise Price	$ 2.33
Exercise Price Range, Three [Member] | Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Weighted Average Exercise Price	$ 10.67
Options Exercisable, Weighted Average Exercise Price	$ 10.67
Exercise Price Range, Three [Member] | Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Weighted Average Exercise Price	$ 1.51
Options Exercisable, Weighted Average Exercise Price	$ 1.51