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Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Swiss Plan      
Change in Projected Benefit Obligation:      
Projected benefit obligation, beginning of period $ 7,445 $ 6,363  
Service cost [1] 474 381 $ 469
Interest cost [2] 56 53 65
Participant contributions 361 260  
Benefits deposited (paid) 189 (185)  
Actuarial loss (gain) 269 721  
Prior service credit 0 (148)  
Projected benefit obligation, end of period 8,794 7,445 6,363
Change in Plan Assets:      
Plan assets at fair value, beginning of period 4,144 3,606  
Actual return on plan assets 3 203  
Employer contributions 433 260  
Participant contributions 361 260  
Benefits deposited (paid) 189 (185)  
Plan assets at fair value, end of period 5,130 4,144 3,606
Funded status (pension liability), end of year [3] (3,664) (3,301)  
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax:      
Actuarial loss on plan assets (1,035) (934)  
Actuarial loss on benefit obligation (2,145) (1,902)  
Actuarial gain (loss) recognized in current year 630 527  
Prior service credit 165 184  
Effect of curtailments 609 609  
Accumulated other comprehensive income (loss) (1,776) (1,516)  
Accumulated benefit obligation at year end (8,230) (6,932)  
Japan Plan      
Change in Projected Benefit Obligation:      
Projected benefit obligation, beginning of period 1,352 1,240  
Service cost [1] 153 147 148
Interest cost [4] 4 4 6
Benefits deposited (paid) (9) (116)  
Actuarial loss (gain) 119 32  
Foreign exchange adjustment 27 45  
Projected benefit obligation, end of period 1,646 1,352 1,240
Change in Plan Assets:      
Plan assets at fair value, beginning of period 0 0  
Actual return on plan assets 0 0  
Employer contributions 0 0  
Plan assets at fair value, end of period 0 0 $ 0
Benefits paid 0 0  
Distribution of plan assets 0 0  
Foreign exchange adjustment 0 0  
Funded status (pension liability), end of year (1,646) (1,352)  
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax:      
Transition obligation 0 (7)  
Actuarial gain (loss) recognized in current year (36) (35)  
Prior service credit 8 8  
Net gain (loss) 38 122  
Accumulated other comprehensive income (loss) 10 88  
Accumulated benefit obligation at year end $ (1,416) $ (1,158)  
[1] Recognized in selling general and administrative expenses on the Consolidated Statements of Operations.
[2] For year ended 2018, recognized in other income (expense), net, and for years ended 2017 and 2016, recognized in selling, general and administrative expenses on the Consolidated Statements of Operations.
[3] The underfunded balance was included in pension liability on the Consolidated Balance Sheets.
[4] For the year ended 2018, recognized in other income (expense), net, and for the years ended 2017 and 2016, recognized in selling, general and administrative expenses on the Consolidated Statements of Operations.