Stock-Based Compensation (Details 2)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options | shares	4,045,869
Options Outstanding, Weighted Average Exercise Price	$ 4.70
Options Outstanding, Weighted Average Remaining Contractual Term	7 years 5 months 26 days
Options Exercisable, Number of Options | shares	2,533,202
Options Exercisable, Weighted Average Exercise Price	$ 2.57
Exercise Price Range, One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Exercise Price Range, Lower Range Limit	0.79
Options Outstanding, Exercise Price Range, Upper Range Limit	$ 1.00
Options Outstanding, Number of Options | shares	50,000
Options Outstanding, Weighted Average Exercise Price	$ 0.79
Options Outstanding, Weighted Average Remaining Contractual Term	3 years 9 months 4 days
Options Exercisable, Number of Options | shares	50,000
Options Exercisable, Weighted Average Exercise Price	$ 0.79
Exercise Price Range, Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Exercise Price Range, Lower Range Limit	1.01
Options Outstanding, Exercise Price Range, Upper Range Limit	$ 1.50
Options Outstanding, Number of Options | shares	1,861,400
Options Outstanding, Weighted Average Exercise Price	$ 1.07
Options Outstanding, Weighted Average Remaining Contractual Term	5 years 10 months 20 days
Options Exercisable, Number of Options | shares	1,851,400
Options Exercisable, Weighted Average Exercise Price	$ 1.07
Exercise Price Range, Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Exercise Price Range, Lower Range Limit	1.51
Options Outstanding, Exercise Price Range, Upper Range Limit	$ 10.67
Options Outstanding, Number of Options | shares	2,134,469
Options Outstanding, Weighted Average Exercise Price	$ 7.95
Options Outstanding, Weighted Average Remaining Contractual Term	8 years 11 months 19 days
Options Exercisable, Number of Options | shares	631,802
Options Exercisable, Weighted Average Exercise Price	$ 7.12