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Balance Sheet Accounts (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |  |
Cash |  | $ 5,098 |  | $ 4,066 |  |  |
Money market funds |  | 35,195 |  | 57,715 |  |  |
Total cash and cash equivalents | [2] | $ 40,293 | [1] | $ 61,781 | [1] | $ 62,710 | $ 51,415
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method
[2] | As adjusted for the adoption of ASC 606 using the full retrospective method

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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