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Net Loss Per Share - Anti-dilutive Securities (Detail) - $ / shares
3 Months Ended
Mar. 27, 2020
Mar. 29, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive equity awards outstanding 6,307,000 7,784,000
Stock Option    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive equity awards outstanding 1,796,000 2,941,000
Restricted Stock Units (RSUs)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive equity awards outstanding 2,899,000 2,400,000
Employee Stock Purchase Plan    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive equity awards outstanding 443,000 489,000
Convertible Debt    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive equity awards outstanding 1,169,000 0
Warrant    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive equity awards outstanding [1] 0 1,954,000
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  
Effect of dilutive securities from convertible debt 7,962,609  
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  
Effect of dilutive securities from convertible debt 13,337,182  
[1] See Note 15, “Warrants” for additional information.