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Fair Value Measurements - Investments at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, at Carrying Value $ 109,201 $ 202,953  
Gross Unrealized Gains 0 1  
Cash and cash equivalents 109,201 202,954 $ 116,345
Debt Securities, Available-for-sale, Amortized Cost   26,603  
Gross Unrealized Gains   0  
Gross Unrealized Losses   (92)  
Fair Value   26,511  
Cash, Cash Equivalents, and Short-term Investments 109,200 229,556  
Gross Unrealized Gains   1  
Gross Unrealized Losses   (92)  
Fair Value   229,465  
U.S. agency notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost   3,000  
Gross Unrealized Gains   0  
Gross Unrealized Losses   (1)  
Fair Value   2,999  
Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost   23,603  
Gross Unrealized Gains   0  
Gross Unrealized Losses   (91)  
Fair Value   23,512  
Cash      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, at Carrying Value 109,201 168,620  
Cash and cash equivalents $ 109,201 168,620  
Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, at Carrying Value   10,347  
Cash and cash equivalents   10,347  
U.S. treasuries      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, at Carrying Value   23,986  
Gross Unrealized Gains   1  
Cash and cash equivalents   $ 23,987