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Stockholders' Equity And Stock-Based Compensation (Summary Of Exercise Price Of Stock Options Outstanding And Exercisable) (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Number outstanding | shares 1,229,355
Weighted average remaining contractual life (in years) 7 years 7 months 6 days
Weighted average exercise price $ 3.82
Number vested | shares 354,855
Weighted average exercise price $ 3.34
$2.67 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Number outstanding | shares 302,620
Weighted average remaining contractual life (in years) 3 years 3 months 18 days
Weighted average exercise price $ 2.67
Number vested | shares 176,528
Weighted average exercise price $ 2.67
$4.00 - $4.28 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise price, lower range 4.00
Exercise price, upper range $ 4.28
Number outstanding | shares 692,335
Weighted average remaining contractual life (in years) 8 years 10 months 24 days
Weighted average exercise price $ 4.02
Number vested | shares 178,327
Weighted average exercise price $ 4.00
$4.67 - $4.68 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Exercise price, lower range 4.67
Exercise price, upper range $ 4.68
Number outstanding | shares 234,400
Weighted average remaining contractual life (in years) 9 years 7 months 6 days
Weighted average exercise price $ 4.68