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 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 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) 9,095 3,272 9,281 3,142
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 5 0 13
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) 343 225 384 375
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) 504 0 515 0
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) 5,477 3,042 5,611 2,754