Stock-Based Compensation (Details 1) - Stock option [Member]	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Summary of all stock option plans
Number of Options Outstanding, Beginning Balance | shares	1,756,000
Number of Options outstanding, Granted | shares	300,000
Number of Options Outstanding, Cancelled | shares	(584,000)
Number of Options Outstanding, Expired | shares	(260,000)
Number of Options Outstanding, Ending Balance | shares	1,212,000
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 4.20
Weighted Average Exercise Price, Expired, Granted | $ / shares	1.50
Weighted Average Exercise Price, Cancelled | $ / shares	4.10
Weighted Average Exercise Price, Expired | $ / shares	4.15
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	$ 3.59