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Unaudited Selected Quarterly Financial Data (Schedule Of Unaudited Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Unaudited Selected Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 24,935 | $ 23,545 | $ 20,073 | $ 24,915 | $ 25,722 | $ 25,118 | $ 20,747 | $ 19,127 | $ 93,468 | $ 90,714 | $ 92,782
Total gross profit | 9,494 | 8,227 | 8,001 | 8,937 | 11,374 | 12,638 | 10,644 | 9,504 | 34,659 | 44,160 | 53,450
Total operating expenses | 30,023 | 29,796 | 32,388 | 32,236 | 29,248 | 29,373 | 28,714 | 28,069 | 124,443 | 115,404 | 82,584
Loss from operations | (20,529) | (21,569) | (24,387) | (23,299) | (17,874) | (16,735) | (18,070) | (18,565) | (89,784) | (71,244) | (29,134)
Net loss | $ (20,762) | $ (22,021) | $ (25,539) | $ (23,867) | $ (19,030) | $ (17,494) | $ (18,499) | $ (19,352) | $ (92,189) | $ (74,375) | $ (31,696)
Basic and diluted net loss per share | $ (0.18) | $ (0.19) | $ (0.26) | $ (0.26) | $ (0.21) | $ (0.19) | $ (0.21) | $ (0.23) |  |  |
Weighted average shares used in computing net loss per share | 116,259 | 115,771 | 97,360 | 92,970 | 92,660 | 92,110 | 88,148 | 83,604 | 105,682 | 89,148 | 75,614

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