Stock Plans (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number of Shares
Balance at December 31, 2016	414,000
Granted	50,000	0
Cancelled	(103,000)
Balance at December 31, 2017	361,000	414,000
Vested or expected to vest at December 31, 2017	354,000
Exercisable at December 31, 2017	220,000
Weighted Average Exercise Price
Balance at December 31, 2016	$ 8.97
Granted	5.56
Cancelled	10.56
Balance at December 31, 2017	8.05	$ 8.97
Vested or expected to vest at December 31, 2017	8.09
Exercisable at December 31, 2017	$ 9.20
Additional Disclosures
Balance at period end, Weighted Average Remaining Contractual Term (in years)	5 years 8 months 20 days
Balance at period end, Aggregate Intrinsic Value	$ 67
Vested or expected to vest, Weighted Average Contractual Term (in years)	5 years 8 months 5 days
Vested or expected to vest, Aggregate Intrinsic Value	$ 65
Exercisable, Weighted Average Contractual Term (in years)	4 years 4 months 20 days
Exercisable, Aggregate Intrinsic Value	$ 30