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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 29, 2017
Swiss Plan [Member] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following table shows the changes in the benefit obligation and plan assets and the Swiss Plan’s funded status as of December 29, 2017 and December 30, 2016 (in thousands):
|  | 2017 |  | 2016 |
Change in Projected Benefit Obligation: |  |  |  |  |  |  |
Projected benefit obligation, beginning of period |  | $ | 6,363 |  | $ | 6,349 |
Service cost |  |  | 381 |  |  | 469 |
Interest cost |  |  | 53 |  |  | 65 |
Participant contributions |  |  | 260 |  |  | 230 |
Benefits deposited (paid) |  |  | (185) |  |  | (340) |
Actuarial loss (gain) |  |  | 721 |  |  | (410) |
Prior service credit |  |  | (148) |  |  | — |
Projected benefit obligation, end of period |  | $ | 7,445 |  | $ | 6,363 |
Change in Plan Assets: |  |  |  |  |  |  |
Plan assets at fair value, beginning of period |  | $ | 3,606 |  | $ | 3,498 |
Actual return on plan assets (including foreign currency impact) |  |  | 203 |  |  | (12) |
Employer contributions |  |  | 260 |  |  | 230 |
Participant contributions |  |  | 260 |  |  | 230 |
Benefits deposited (paid) |  |  | (185) |  |  | (340) |
Plan assets at fair value, end of period |  | $ | 4,144 |  | $ | 3,606 |
Funded status pension liability, end of year |  | $ | (3,301) |  | $ | (2,757) |
Amount Recognized in Accumulated Other Comprehensive Loss, net of tax: |  |  |  |  |  |  |
Actuarial loss on plan assets |  | $ | (932) |  | $ | (816) |
Actuarial loss on benefit obligation |  |  | (1,902) |  |  | (1,393) |
Actuarial gain recognized in current year |  |  | 527 |  |  | 454 |
Prior service credit |  |  | 184 |  |  | (6) |
Effect of curtailments |  |  | 609 |  |  | 606 |
Accumulated other comprehensive loss |  | $ | (1,514) |  | $ | (1,155) |
Accumulated benefit obligation at end of year |  | $ | (6,932) |  | $ | (5,980) |
Schedule of Net Benefit Costs [Table Text Block] | Net periodic pension cost associated with the Swiss Plan during the years ended December 29, 2017, December 30, 2016 and January 1, 2016 include the following components (in thousands):
|  | 2017 |  | 2016 |  | 2015 |
Service cost |  | $ | 381 |  | $ | 469 |  | $ | 316 |
Interest cost |  |  | 53 |  |  | 65 |  |  | 74 |
Expected return on plan assets |  |  | (94) |  |  | (89) |  |  | (93) |
Actuarial loss recognized in current year |  |  | 72 |  |  | 111 |  |  | 64 |
Prior service credit |  |  | (7) |  |  | (7) |  |  | — |
Net periodic pension cost |  | $ | 405 |  | $ | 549 |  | $ | 361 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Changes in other comprehensive income (loss), net of tax, associated with the Swiss Plan in the year ended December 29, 2017, December 30, 2016 and January 1, 2016 include the following components (in thousands):
|  | 2017 |  | 2016 |  | 2015 |
Current year actuarial gain (loss) on plan assets |  | $ | 97 |  | $ | (8) |  | $ | 61 |
Current year actuarial loss on benefit obligation |  |  | (645) |  |  | (269) |  |  | (699) |
Actuarial gain (loss) recorded in current year |  |  | 65 |  |  | (98) |  |  | 57 |
Prior service credit |  |  | 126 |  |  | (6) |  |  | 64 |
Effect of curtailments |  |  | 3 |  |  | — |  |  | — |
Change in other comprehensive loss |  | $ | (354) |  | $ | (381) |  | $ | (517) |
Schedule of Assumptions Used [Table Text Block] | Net periodic pension cost and projected and accumulated pension obligation for the Company’s Swiss Plan were calculated on December 29, 2017 and December 30, 2016 using the following assumptions:
|  | 2017 |  | 2016 |
Discount rate |  |  | 0.7 | % |  | 0.8 | %
Salary increases |  |  | 2.0 | % |  | 2.0 | %
Expected return on plan assets |  |  | 2.5 | % |  | 2.5 | %
Expected average remaining working lives in years |  |  | 10.2 |  |  | 10.0 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | The table below sets forth the fair value of Plan assets at December 30, 2016 and December 29, 2017, and the related activity in fiscal years 2016 and 2017, in accordance with ASC 715-20-50-1(d) (in thousands):
|  | Insurance Contracts |
|  | (Level 3) |
Beginning balance at January 1, 2016 |  | $ | 3,498 |
Actual return on plan assets |  |  | (12) |
Purchases, sales, and settlement |  |  | 120 |
Ending balance at December 30, 2016 |  |  | 3,606 |
Actual return on plan assets |  |  | 203 |
Purchases, sales, and settlement |  |  | 335 |
Ending balance at December 29, 2017 |  | $ | 4,144 |
Schedule Of Defined Benefit Plan Estimated Future Benefit Payments [Table Text Block] | The estimated future benefit payments for the Swiss Plan are as follows (in thousands):
Fiscal Year |  | Amount |
2018 |  | $ | 48 |
2019 |  |  | 53 |
2020 |  |  | 58 |
2021 |  |  | 64 |
2022 |  |  | 71 |
Thereafter |  |  | 458 |
Total |  | $ | 752 |
Japan Plan [Member] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The funded status of the benefit plan at December 29, 2017 and December 30, 2016 is as follows (in thousands):
|  | 2017 |  | 2016 |
Change in Projected Benefit Obligation: |  |  |  |  |  |  |
Projected benefit obligation, beginning of period |  | $ | 1,240 |  | $ | 1,035 |
Service cost |  |  | 147 |  |  | 148 |
Interest cost |  |  | 4 |  |  | 6 |
Actuarial gain |  |  | 32 |  |  | 49 |
Benefits paid |  |  | (116) |  |  | (17) |
Foreign exchange adjustment |  |  | 45 |  |  | 19 |
Projected benefit obligation, end of period |  | $ | 1,352 |  | $ | 1,240 |
Changes in Plan Assets: |  |  |  |  |  |  |
Plan assets at fair value, beginning of period |  | $ | — |  | $ | — |
Actual return on plan assets |  |  | — |  |  | — |
Employer contributions |  |  | — |  |  | — |
Benefits paid |  |  | — |  |  | — |
Distribution of plan assets |  |  | — |  |  | — |
Foreign exchange adjustment |  |  | — |  |  | — |
Plan assets at fair value, end of period |  | $ | — |  | $ | — |
Funded status (pension liability), end of period |  | $ | (1,352) |  | $ | (1,240) |
Amount Recognized in Accumulated Other Comprehensive Income, Net of Tax: |  |  |  |  |  |  |
Transition obligation |  | $ | (7) |  | $ | (14) |
Actuarial gain (loss) |  |  | (35) |  |  | (31) |
Prior service cost |  |  | 8 |  |  | 8 |
Net gain (loss) |  |  | 122 |  |  | 125 |
Accumulated other comprehensive income |  | $ | 88 |  | $ | 88 |
Accumulated benefit obligation at end of year |  | $ | (1,158) |  | $ | (1,078) |
Schedule of Net Benefit Costs [Table Text Block] | Net periodic pension cost associated with the Japan Plan for the years ended December 29, 2017, December 30, 2016 and January 1, 2016 includes the following components (in thousands):
|  | 2017 |  | 2016 |  | 2015 |
Service cost |  | $ | 147 |  | $ | 148 |  | $ | 121 |
Interest cost |  |  | 4 |  |  | 6 |  |  | 6 |
Net amortization of transition obligation |  |  | 11 |  |  | 12 |  |  | 11 |
Actuarial loss |  |  | (1) |  |  | (13) |  |  | (15) |
Prior service credit |  |  | (3) |  |  | (1) |  |  | (2) |
Net periodic pension cost |  | $ | 158 |  | $ | 152 |  | $ | 121 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Changes in other comprehensive income (loss), net of tax, associated with the Japan Plan for the years ended December 29, 2017, December 30, 2016 and January 1, 2016 include the following components (in thousands):
|  | 2017 |  | 2016 |  | 2015 |
Amortization of net transition obligation |  | $ | 7 |  | $ | 8 |  | $ | 7 |
Amortization of actuarial gain (loss) |  |  | (1) |  |  | 25 |  |  | (21) |
Actuarial income (loss) recorded in current year |  |  | (19) |  |  | (40) |  |  | (10) |
Change in other comprehensive income (loss) |  | $ | (13) |  | $ | (7) |  | $ | (24) |
Schedule of Assumptions Used [Table Text Block] | Net periodic pension cost and projected and accumulated pension obligation for the Company’s Japan Plan were calculated on December 29, 2017 and December 30, 2016 using the following assumptions:
|  | 2017 |  | 2016 |
Discount rate |  |  | 0.3 | % |  | 0.3 | %
Salary increases |  |  | 6.2 | % |  | 6.0 | %
Expected return on plan assets |  |  | N/A |  |  | N/A |
Expected average remaining working lives in years |  |  | 9.08 |  |  | 8.84 |
Schedule Of Defined Benefit Plan Estimated Future Benefit Payments [Table Text Block] | The estimated future benefit payments for the Japan Plan are as follows (in thousands):
Fiscal Year |  | Amount |
2018 |  | $ | 46 |
2019 |  |  | 51 |
2020 |  |  | 56 |
2021 |  |  | 101 |
2022 |  |  | 62 |
Thereafter |  |  | 729 |
Total |  | $ | 1,045 |

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