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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unaudited Selected Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 19,526 | $ 18,160 | $ 21,578 | $ 19,362 | $ 24,935 | $ 23,545 | $ 20,073 | $ 24,915 | $ 78,626 | $ 93,468 | $ 90,714
Total gross profit | 5,746 | 3,192 | 8,862 | 7,296 | 9,494 | 8,227 | 8,001 | 8,937 | 25,096 | 34,659 | 44,160
Total operating expenses | 36,369 | 27,862 | 30,607 | 31,245 | 30,023 | 29,796 | 32,388 | 32,236 | 126,083 | 124,443 | 115,404
Loss from operations | (30,623) | (24,670) | (21,745) | (23,949) | (20,529) | (21,569) | (24,387) | (23,299) | (100,987) | (89,784) | (71,244)
Net loss | $ (30,799) | $ (25,044) | $ (22,540) | $ (24,179) | $ (20,762) | $ (22,021) | $ (25,539) | $ (23,867) | $ (102,562) | $ (92,189) | $ (74,375)
Basic and diluted net loss per share | $ (0.21) | $ (0.19) | $ (0.17) | $ (0.20) | $ (0.18) | $ (0.19) | $ (0.26) | $ (0.26) |  |  |
Weighted average shares used in computing net loss per share | 149,314 | 135,130 | 131,882 | 123,768 | 116,259 | 115,771 | 97,360 | 92,970 | 135,094 | 105,682 | 89,148

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