Stockholders' Equity - Schedule of Stock Option Activity (Details) - Stock Option Plans [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Subject to Issuance, Outstanding	1,665,420	1,901,298
Number of Shares Subject to Issuance, Granted		269,543
Number of Shares Subject to Issuance, Forfeited or expired	(24,062)	(160,294)
Number of Shares Subject to Issuance, Exercised	(10,000)	(345,127)
Number of Shares Subject to Issuance, Outstanding	1,631,358	1,665,420
Number of Shares Subject to Issuance, Exercisable	1,457,764
Weighted-average Exercise Price, Outstanding	$ 1.40	$ 1.46
Weighted-average Exercise Price, Granted		1.31
Weighted-average Exercise Price, Forfeited or expired	4.06	2.58
Weighted-average Exercise Price, Exercised	1.01	1.13
Weighted-average Exercise Price, Outstanding	1.36	$ 1.40
Weighted-average Exercise Price, Exercisable	$ 1.37
Weighted-average Remaining Contractual Term, Outstanding Beginning	3 years 7 months 13 days	4 years 6 months 3 days
Weighted-average Remaining Contractual Term, Outstanding Ending	1 year 8 months 12 days	3 years 7 months 13 days
Weighted-average Remaining Contractual Term, Exercisable	1 year 6 months 21 days
Outstanding-Aggregate Intrinsic Value, Ending	$ 2,106,669
Exercisable-Aggregate Intrinsic Value	$ 1,887,777