Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Weighted average exercise price per share	$ 3.34
Weighted average remaining life	7 years 7 months 6 days
Stock Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Beginning Balance, Number of shares	875,221
Issued, Number of shares	405,132
Exercised, Number of shares
Expired/terminated, Number of shares	(50,998)
Ending Balance, Number of shares	1,229,355	875,221
Vested and expected to vest, Number of shares	1,229,355
Exercisable, Number of shares	354,855
Beginning Balance, Weighted average exercise price per share	$ 3.51
Issued, Weighted average exercise price per share	4.44
Exercised, Weighted average exercise price per share
Expired/terminated, Weighted average exercise price per share	3.57
Ending Balance, Weighted average exercise price per share	3.82	$ 3.51
Vested and expected to vest, Weighted average exercise price per share	3.82
Exercisable, Weighted average exercise price per share	$ 3.34
Weighted average remaining life		7 years 9 months 18 days
Weighted average remaining life, Vested and expected to vest	7 years 7 months 6 days
Weighted average remaining life, exercisable	6 years
$2.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Weighted average exercise price per share	$ 2.67
Weighted average remaining life	3 years 3 months 18 days