Stock-Based Compensation (Details 1) - Stock Option [Member] - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Beginning Balance	5,981,106	3,909,580	4,453,746
Options, Granted	3,781,666	2,382,500	222,500
Options, Exercised	(35,008)	(6,583)	(291,666)
Options, Expired	(483,332)
Options, Forfeited	(302,502)	(304,391)	(475,000)
Options, Ending Balance	8,941,930	5,981,106	3,909,580	4,453,746
Options, Exercisable	4,757,754
Weighted Average Exercise Price, Beginning Balance	$ 2.01	$ 1.78	$ 1.78
Weighted Average Exercise Price, Granted	2.37	2.36	1.69
Weighted Average Exercise Price, Exercised	1.16	0.58	0.79
Weighted Average Exercise Price, Expired	2.48
Weighted Average Exercise Price, Forfeited	1.91	1.93	2.3
Weighted Average Exercise Price, Ending Balance	2.14	$ 2.01	$ 1.78	$ 1.78
Weighted Average Exercise Price, Exercisable	$ 1.92
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 8 months 1 day	5 years 9 months 18 days	5 years 7 months 2 days	6 years 5 months 5 days
Weighted Average Remaining Contractual Life, Exercisable	4 years 6 months 14 days
Aggregate Intrinsic Value, Beginning Balance	$ 685,000	$ 785,000	$ 1,308,000
Aggregate Intrinsic Value, Exercised	44,000	8,000	71,000
Aggregate Intrinsic Value, Ending Balance	2,900,000	685,000	785,000	$ 1,308,000
Aggregate Intrinsic Value, Exercisable	2,272,000
Grant date fair value of options granted	$ 7,974,000	$ 4,974,000	$ 350,000
Weighted average grant date fair value	$ 2.12	$ 2.09	$ 1.57