Stock-Based Compensation (Details 1) - Stock Option [Member] - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Beginning Balance	8,941,930	5,981,106
Options, Granted	150,000	3,781,666
Options, Exercised	0	(35,008)
Options, Expired	(99,502)	(483,332)
Options, Forfeited	0	(302,502)
Options, Ending Balance	8,992,428	8,941,930	5,981,106
Options, Exercisable	5,093,799
Weighted Average Exercise Price, Beginning Balance	$ 2.14	$ 2.01
Weighted Average Exercise Price, Granted	1.16	2.37
Weighted Average Exercise Price, Exercised	0	1.16
Weighted Average Exercise Price, Expired	2.22	2.48
Weighted Average Exercise Price, Forfeited	0	1.91
Weighted Average Exercise Price, Ending Balance	2.13	$ 2.14	$ 2.01
Weighted Average Exercise Price, Exercisable	$ 1.95
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 4 months 28 days	5 years 9 months 18 days	5 years 9 months 18 days
Weighted Average Remaining Contractual Life, Exercisable	4 years 4 months 17 days
Aggregate Intrinsic Value, Beginning Balance	$ 2,900,000	$ 685,000
Aggregate Intrinsic Value, Exercised	0	44,000
Aggregate Intrinsic Value, Ending Balance	3,400,000	2,900,000	$ 685,000
Aggregate Intrinsic Value, Exercisable	2,600,000
Grant date fair value of options granted	$ 153,000	$ 7,974,000
Weighted average grant date fair value	$ 1.02	$ 2.12