Stock-Based Compensation (Details 1) - Stock Option [Member] - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 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	(271,866)	(338,529)
Options, Forfeited	0	(383,265)
Options, Ending Balance	11,489,515	11,636,227	8,941,930
Options, Exercisable	6,177,207
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	1.84	1.96
Weighted Average Exercise Price, Forfeited	0	2.26
Weighted Average Exercise Price, Ending Balance	1.77	$ 1.77	$ 2.14
Weighted Average Exercise Price, Exercisable	$ 2.11
Weighted Average Remaining Contractual Life, Balance Outstanding	5 years 8 months 23 days	5 years 5 months 26 days	5 years 8 months 1 day
Weighted Average Remaining Contractual Life, Exercisable	4 years 11 months 8 days
Aggregate Intrinsic Value, Beginning Balance	$ 194,355	$ 2,900,000
Aggregate Intrinsic Value, Exercised	163,050	137,488
Aggregate Intrinsic Value, Ending Balance	17,427	194,355	$ 2,900,000
Aggregate Intrinsic Value, Exercisable	17,427
Grant date fair value of options granted	$ 308,000	$ 3,091,000
Weighted average grant date fair value	$ 0.57	$ 0.8