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Selected Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Results:                      
Revenue $ 46,062 $ 42,150 $ 45,231 $ 41,273 $ 41,157 $ 38,340 $ 39,672 $ 35,940 $ 174,716 $ 155,109 $ 129,755
Gross profit 32,683 30,918 32,554 30,008 28,897 27,472 28,818 25,914 126,163 111,101 92,875
Loss from operations (2,135) (6,847) (6,355) (9,642) (7,695) (6,286) (7,738) (9,419) (24,979) (31,138) (26,720)
Net loss $ (2,580) $ (7,246) $ (6,883) $ (10,183) $ (8,625) $ (6,783) $ (8,206) $ (9,724) $ (26,892) $ (33,338) $ (27,212)
Net loss per share (basic and diluted) $ (0.08) $ (0.22) $ (0.21) $ (0.32) $ (0.27) $ (0.21) $ (0.26) $ (0.31)