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NET INCOME (LOSS) PER SHARE - Anti-Dilutive Securities (Details) - shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Anti-Dilutive Securities |  |  |
Anti-dilutive securities (in shares) | 2,121 | 4,073 | 19,838
Equity incentive plans and ESPP |  |  |
Anti-Dilutive Securities |  |  |
Anti-dilutive securities (in shares) | 2,121 | 4,073 | 6,934
Convertible subordinated notes |  |  |
Anti-Dilutive Securities |  |  |
Anti-dilutive securities (in shares) | 0 | 0 | 12,904

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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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