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Net Income (Loss) Per Share - Anti-dilutive Securities (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 25, 2020 | Sep. 27, 2019 | Sep. 25, 2020 | Sep. 27, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Potentially dilutive equity awards outstanding |  | 5,419,000 | 686,000 | 5,609,000 | 11,318,000
Effect of dilutive securities from convertible debt |  | 0 | 3,468,000 | 0 | 0
Stock Option |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Potentially dilutive equity awards outstanding |  | 1,558,000 | 678,000 | 1,637,000 | 2,699,000
Restricted Stock Units (RSUs) |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Potentially dilutive equity awards outstanding |  | 3,336,000 | 8,000 | 3,066,000 | 2,860,000
Employee Stock Purchase Plan |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Potentially dilutive equity awards outstanding |  | 525,000 | 0 | 516,000 | 475,000
Convertible Debt |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Potentially dilutive equity awards outstanding |  | 0 | 0 | 390,000 | 1,156,000
Warrant |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Potentially dilutive equity awards outstanding | [1] | 0 | 0 | 0 | 4,128,000
Company average common stock price for a given period exceeds conversion price $5.75 for 2020 Notes [Member] | Convertible Note due 2020 |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  | $ 5.75 |  | $ 5.75 |
Effect of dilutive securities from convertible debt |  |  |  | 1,400,522 |
Company average common stock price for a given period exceeds conversion price $5.75 for 2022 Notes [Member] | Convertible Note due 2022 |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  | 5.75 |  | $ 5.75 |
Effect of dilutive securities from convertible debt |  |  |  | 6,557,739 |
Company average common stock price for a given period exceeds conversion price $8.66 for 2024 Notes [Member] | Convertible Note due 2024 |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  | $ 8.66 |  | $ 8.66 |
Effect of dilutive securities from convertible debt |  |  |  | 13,337,182 |
[1] | See Note 15, “Warrants” for additional information.

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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/disclosureRef -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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