Quarterly report pursuant to Section 13 or 15(d)

Net (Loss) Income Per Share - Anti-Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Details)

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Net (Loss) Income Per Share - Anti-Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 8,500 3,911 8,706 3,687
Common stock warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 0 0 0 8
Performance stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 0 224 0 302
Restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 490 115 507 221
Series A Convertible Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 2,771 0 2,771 0
Options to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) 5,239 3,572 5,428 3,156