Stock-based Compensation (Details 1) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning	1,651,800	1,477,300
Granted	179,471	258,500
Exercised	(49,000)	(18,000)
Forfeited	(50,500)	(1,000)
Expired	(10,600)	(65,000)
Outstanding at ending	1,721,171	1,651,800		1,477,300
Exercisable at ending	1,443,296
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning	$ 1.67	$ 1.61
Granted	1.53	4.62
Exercised	0.50	0.50
Forfeited		0.50
Expired		10.22
Outstanding at ending	1.57	$ 1.67		$ 1.61
Exercisable at ending	$ 1.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Life [Roll Forward]
Granted	4 years 4 months 24 days	5 years
Outstanding at ending	3 years 8 months 12 days	3 years 8 months 12 days		5 years 9 months 18 days
Exercisable at ending	3 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Roll Forward]
Outstanding at beginning		$ 9,662	[1]
Granted		34	[1]
Outstanding at ending				$ 9,662	[1]
Exercisable at ending

[1] The aggregate intrinsic value on the table was calculated based on the difference between the estimated fair value of the Company's stock and the exercise price of the underlying option. The estimated stock values used in the calculation was $0.59 and $0.72 per share for each of the years ended December 31, 2018 and 2017 respectively.