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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.