Stock-Based Compensation (Details 1) - Stock Option [Member] - USD ($)	6 Months Ended	12 Months Ended
	Jun. 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	(10,842)	(6,583)
Options, Forfeited	(302,502)	(304,391)
Options, Ending Balance	7,467,762	5,981,106	3,909,580
Options, Exercisable	4,515,532
Weighted Average Exercise Price, Beginning Balance	$ 2.01	$ 1.78
Weighted Average Exercise Price, Granted	2.00	2.36
Weighted Average Exercise Price, Exercised	0.09	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	$ 1.92
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 9 months 14 days	5 years 9 months 18 days	5 years 7 months 2 days
Weighted Average Remaining Contractual Life, Exercisable	5 years 6 months 4 days
Aggregate Intrinsic Value, Beginning Balance	$ 685,000	$ 785,000
Aggregate Intrinsic Value, Ending Balance	6,319,000	685,000	$ 785,000
Aggregate Intrinsic Value, Exercisable	4,283,000
Grant date fair value of options granted	$ 3,245,000	$ 4,974,000
Weighted average grant date fair value	$ 1.80	$ 2.09