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The Company and Summary of Significant Accounting Policies - Schedule of 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Anti-dilutive Securities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 45,164 | 2,427 | 1,640
Options |  |  |
Anti-dilutive Securities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 337 | 307 | 522
Employee stock purchase plan |  |  |
Anti-dilutive Securities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  | 44
RSU's |  |  |
Anti-dilutive Securities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 272 | 376 | 148
Convertible Debt |  |  |
Anti-dilutive Securities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 4,671 | 1,081 | 926
Outstanding Warrants |  |  |
Anti-dilutive Securities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 39,884 | 663 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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