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Net Loss Per Share - Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) | 6,093 | 7,707 | 8,257
Employee Stock Options |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) | 4,047 | 5,556 | 6,092
Restricted Stock Units |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) | 2,033 | 2,019 | 1,818
ESPP |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) | 0 | 0 | 156
Common stock warrants |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |
Anti-dilutive securities excluded from calculation of diluted net loss per share (in shares) | 13 | 132 | 191

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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