Stock Compensation (Schedule Of Option Activity) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 $ / shares shares
Stock Compensation [Abstract]
Outstanding, Number of Shares | shares	4,218,139
Options granted, Number of Shares | shares	1,435,097
Options exercised, Number of Shares | shares	(21,912)	(254,351)
Options forfeited, Number of Shares | shares	(52,781)
Options cancelled or expired, Number of Shares | shares	(522,802)
Outstanding, Number of Shares | shares	5,055,741	4,218,139
Vested or expected to vest, Number of Shares | shares	5,035,622
Exercisable, Number of Shares | shares	4,049,888
Outstanding, Weighted Average Exercise Price | $ / shares	$ 3.75
Options granted, Weighted Average Exercise Price | $ / shares	2.45
Options exercised, Weighted Average Exercise Price | $ / shares	2.10
Options forfeited, Weighted Average Exercise Price | $ / shares	2.02
Options cancelled or expired, Weighted Average Exercise Price | $ / shares	7.44
Outstanding, Weighted Average Exercise Price | $ / shares	3.00	$ 3.75
Vested or expected to vest, Weighted Average Exercise Price | $ / shares	3.00
Exercisable, Weighted Average Exercise Price | $ / shares	$ 3.08
Outstanding, Weighted Average Remaining Contractual Life (In Years)	4 years 5 months 16 days
Vested or expected to vest, Weighted Average Remaining Contractual Life (In Years)	4 years 5 months 16 days
Exercisable, Weighted Average Remaining Contractual Life (In Years)	4 years 4 days
Outstanding, Aggregate Intrinsic Value | $	$ 875,225
Vested or expected to vest, Aggregate Intrinsic Value | $	875,030
Exercisable, Aggregate Intrinsic Value | $	$ 865,475