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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended
Jun. 01, 2018
USD ($)
Mar. 30, 2019
USD ($)
installment
$ / shares
shares
Sep. 30, 2018
USD ($)
d
Mar. 30, 2019
USD ($)
installment
$ / shares
shares
Mar. 31, 2018
USD ($)
Mar. 29, 2019
$ / shares
Dec. 29, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt outstanding in long term debt   $ 279,738,000   $ 279,738,000     $ 266,929,000
Proceeds from issuance of debt, net       $ 8,584,000 $ 0    
Closing price of common stock (in usd per share) | $ / shares           $ 4.34  
2.125% Convertible Senior Notes Due September 1, 2024              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument interest percentage   2.125%   2.125%      
Debt outstanding in long term debt   $ 271,447,000   $ 271,447,000     $ 266,929,000
Proceeds from issuance of debt, net     $ 391,400,000        
Payment of capped call     $ 48,900,000        
Strike price (in dollars per share) | $ / shares   $ 9.87   $ 9.87      
Cap price (in dollars per share) | $ / shares   $ 15.19   $ 15.19      
Number of shares covered by capped transactions (in shares) | shares   40.8   40.8      
Conversion ratio     101.2812        
Debt instrument, convertible, if-converted value in excess of principal     $ 1,000        
Conversion price (in dollars per share) | $ / shares   $ 9.87   $ 9.87      
Purchase price as a percentage on principal amount of the notes upon the occurrence of a fundamental change     100.00%        
Net equity component carrying amount   $ 128,700,000   $ 128,700,000      
Deferred tax liability   $ 30,900,000   $ 30,900,000      
Additional effective rate of interest to be used on amortized carrying value   10.07%   10.07%      
Fair value of convertible debt   $ 318,000,000   $ 318,000,000      
2.125% Convertible Senior Notes, Circumstance 1              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Threshold trading days | d     20        
Threshold consecutive trading days | d     30        
Convertible threshold minimum percentage     130.00%        
2.125% Convertible Senior Notes, Circumstance 2              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, convertible, if-converted value in excess of principal     $ 1,000        
Threshold trading days | d     5        
Threshold consecutive trading days | d     5        
Convertible, threshold maximum percentage     98.00%        
1.75% Convertible Senior Notes Due June 1, 2018              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument interest percentage   1.75%   1.75% 1.75%    
Repayment of debt $ 150,000,000            
Additional effective rate of interest to be used on amortized carrying value         10.23%    
Repayment of final coupon interest $ 1,300,000            
Mortgage              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Proceeds from debt   $ 8,700,000          
Debt instrument interest percentage   5.25%   5.25%      
Debt payment installments | installment   59   59      
Debt payment   $ 100,000          
Debt term   5 years          
Debt outstanding   $ 8,700,000   $ 8,700,000      
Debt outstanding in short term debt   400,000   400,000      
Debt outstanding in long term debt   $ 8,300,000   $ 8,300,000