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Net Income (Loss) Per Share (Potentially Dilutive Shares of Common Stock) (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total potentially dilutive shares | 1,645 | 62,458 | 117,478
Outstanding stock options, unvested RSUs and ESPP contributions [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total potentially dilutive shares | 1,645 | 27,568 | 28,470
2014 Warrants [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total potentially dilutive shares | 0 | 1,000 | 1,000
Deerfield Notes [Member] | Convertible debt [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total potentially dilutive shares | 0 | 33,890 | 33,890
2019 Notes [Member] | Convertible debt [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Total potentially dilutive shares | 0 | 0 | 54,118

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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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