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Financial Statement Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financial Statement Components [Abstract] |  |
Prepaid expenses | $ 2,437 | $ 2,199
Other current assets | 2,403 | 809
Prepaid expenses and other current assets | $ 4,840 | $ 3,008

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- Definition Amount of current assets classified as other. + 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 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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