Stock-Based Compensation (Details 1) - Stock Option [Member] - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Beginning Balance	11,636,227	8,941,930
Options, Granted	543,927	3,861,425
Options, Exercised	(418,773)	(445,334)
Options, Expired	(450,962)	(338,529)
Options, Forfeited	(91,404)	(383,265)
Options, Ending Balance	11,219,015	11,636,227	8,941,930
Options, Exercisable	7,205,382
Weighted Average Exercise Price, Beginning Balance	$ 1.77	$ 2.14
Weighted Average Exercise Price, Granted	0.85	0.98
Weighted Average Exercise Price, Exercised	0.4	1.83
Weighted Average Exercise Price, Expired	2	1.96
Weighted Average Exercise Price, Forfeited	2	2.26
Weighted Average Exercise Price, Ending Balance	1.76	$ 1.77	$ 2.14
Weighted Average Exercise Price, Exercisable	$ 2.02
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 3 months 14 days	5 years 5 months 26 days	5 years 8 months 1 day
Weighted Average Remaining Contractual Life, Exercisable	4 years 9 months 7 days
Aggregate Intrinsic Value, Beginning Balance	$ 194,355	$ 2,900,000
Aggregate Intrinsic Value, Exercised	163,050	137,488
Aggregate Intrinsic Value, Ending Balance	548,588	194,355	$ 2,900,000
Aggregate Intrinsic Value, Exercisable	204,437
Grant date fair value of options granted	$ 308,000	$ 3,091,000
Weighted average grant date fair value	$ 0.57	$ 0.80