Stock-Based Compensation (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Range of Exercise Price 0.09-2.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Range of Exercise Price Lower	$ 0.09	$ 0.09	$ 0.09
Options Outstanding, Range of Exercise Price Upper	$ 2.00	$ 2.00	$ 2.00
Options Outstanding, Options	5,769,987	3,029,938	2,703,280
Options Outstanding, Weighted Average Exercise Price	$ 1.00	$ 1.40	$ 1.37
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 4 months 13 days	4 years 1 month 13 days	4 years 3 months 29 days
Options Exercisable, Options	2,324,504	2,363,683	2,018,074
Options Exercisable, Weighted Average Exercise Price	$ 1.19	$ 1.34	$ 1.28
Options Exercisable, Weighted Average Remaining Contractual Life	3 years 2 months 1 day	3 years 4 months 17 days	3 years 8 months 23 days
Range of Exercise Price 2.01-3.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Range of Exercise Price Lower	$ 2.01	$ 2.01	$ 2.01
Options Outstanding, Range of Exercise Price Upper	$ 3.00	$ 3.00	$ 3.00
Options Outstanding, Options	5,820,416	5,866,168	3,232,002
Options Outstanding, Weighted Average Exercise Price	$ 2.50	$ 2.50	$ 2.49
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 7 months 20 days	6 years 6 months	7 years 29 days
Options Exercisable, Options	3,823,321	2,348,247	1,829,298
Options Exercisable, Weighted Average Exercise Price	$ 2.49	$ 2.44	$ 2.40
Options Exercisable, Weighted Average Remaining Contractual Life	5 years 3 months 29 days	5 years 9 months 4 days	6 years 8 months 23 days
Range of Exercise Price 3.01-6.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Range of Exercise Price Lower	$ 3.01	$ 3.01	$ 3.01
Options Outstanding, Range of Exercise Price Upper	$ 6.00	$ 6.00	$ 6.00
Options Outstanding, Options	45,824	45,824	45,824
Options Outstanding, Weighted Average Exercise Price	$ 5.24	$ 5.24	$ 5.24
Options Outstanding, Weighted Average Remaining Contractual Life	7 months 13 days	1 year 7 months 13 days	2 years 7 months 13 days
Options Exercisable, Options	45,824	45,824	45,824
Options Exercisable, Weighted Average Exercise Price	$ 5.24	$ 5.24	$ 5.24
Options Exercisable, Weighted Average Remaining Contractual Life	7 months 13 days	1 year 7 months 13 days	2 years 7 months 13 days
Range of Exercise Price 0.09-6.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Range of Exercise Price Lower	$ 0.09	$ 0.09	$ 0.09
Options Outstanding, Range of Exercise Price Upper	$ 6.00	$ 6.00	$ 6.00
Options Outstanding, Options	11,636,227	8,941,930	5,981,106
Options Outstanding, Weighted Average Exercise Price	$ 1.77	$ 2.14	$ 2.01
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 5 months 26 days	5 years 8 months 1 day	5 years 9 months 18 days
Options Exercisable, Options	6,193,649	4,757,754	3,893,196
Options Exercisable, Weighted Average Exercise Price	$ 2.02	$ 1.92	$ 1.85
Options Exercisable, Weighted Average Remaining Contractual Life	4 years 5 months 26 days	4 years 6 months 14 days	5 years 1 month 13 days