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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) |  |  |

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