Stock-Based Compensation (Details 1) - Stock Option [Member] - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Beginning Balance	5,981,106	3,909,580
Options, Granted	1,800,000	2,382,500
Options, Exercised	(18,342)	(6,583)
Options, Expired	(8,333)
Options, Forfeited	(302,502)	(304,391)
Options, Ending Balance	7,451,929	5,981,106	3,909,580
Options, Exercisable	4,812,626
Weighted Average Exercise Price, Beginning Balance	$ 2.01	$ 1.78
Weighted Average Exercise Price, Granted	2.00	2.36
Weighted Average Exercise Price, Exercised	0.81	0.58
Weighted Average Exercise Price, Forfeited	1.92	1.93
Weighted Average Exercise Price, Ending Balance	2.01	$ 2.01	$ 1.78
Weighted Average Exercise Price, Exercisable	1.93
Weighted Average Exercise Price, Expired	$ 2.73
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 3 months 7 days	5 years 9 months 18 days	5 years 7 months 2 days
Weighted Average Remaining Contractual Life, Exercisable	4 years 1 month 20 days
Aggregate Intrinsic Value, Beginning Balance	$ 685,000	$ 785,000
Aggregate Intrinsic Value, Ending Balance	2,732,000	685,000	$ 785,000
Aggregate Intrinsic Value, Exercisable	2,104,000
Grant date fair value of options granted	$ 3,245,000	$ 4,974,000
Weighted average grant date fair value	$ 1.80	$ 2.09