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Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 25, 2020
USD ($)
May 28, 2019
USD ($)
tradingDay
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Apr. 24, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity             $ 17,000,000  
Short-term borrowings     $ 20,000,000   $ 20,000,000     $ 3,000,000
Proceeds from short-term debt $ 26,000,000       15,000,000 $ 20,000,000    
Interest expense     4,000,000 $ 1,000,000 8,000,000 $ 1,000,000    
Other Current Liabilities                
Debt Instrument [Line Items]                
Short-term borrowings     $ 17,000,000   $ 17,000,000      
Minimum                
Debt Instrument [Line Items]                
Trading days | tradingDay   20            
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024                
Debt Instrument [Line Items]                
Stated interest rate   4.00% 4.00%   4.00%      
Aggregate principal amount of debt   $ 207,000,000            
Net proceeds   200,000,000            
Debt issuance costs   $ 7,000,000            
Amortization period of interest expense   5 years            
Initial conversion price | $ / shares   $ 22.3125            
Threshold percentage of stock price trigger   130.00%            
Redemption price   100.00%            
Effective interest rate     10.00%   10.00%      
Equity component of notes     $ 46,000,000   $ 46,000,000      
Convertible debt fair value     $ 174,000,000   $ 174,000,000      
Debt instrument, convertible, conversion ratio   0.0448179000            
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024 | Minimum                
Debt Instrument [Line Items]                
Threshold percentage of stock price trigger   98.00%            
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024 | Maximum                
Debt Instrument [Line Items]                
Debt instrument, convertible, conversion ratio   0.0571428000