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Restructuring Costs - Narrative (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Dec. 30, 2017 USD ($) ft² Employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs | $ 569 | $ 0 | $ 1,339 | $ 0 |
Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | (55) |  |
Restructuring Plan 2017 [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Manufacturing facility square footage (in sqft) | ft² |  |  |  |  | 160
Expected restructuring costs | 1,745 |  | 1,745 |  |
Restructuring costs |  |  | 1,339 |  |
Expected remaining restructuring costs | $ 203 |  | 203 |  |
Restructuring Plan 2017 [Member] | Employee Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | (55) |  | $ 203
Restructuring Plan 2017 [Member] | Relocation Of Machinery And Equipment And Administrative Offices [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 1,018 |  |
Restructuring Plan 2017 [Member] | Employee Retention, Facility Closing, And Other Closure Costs [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | $ 376 |  |
Restructuring Plan 2017 [Member] | United States [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of positions eliminated related to restructuring | Employee |  |  |  |  | 4
Restructuring Plan 2017 [Member] | Sweden [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of positions eliminated related to restructuring | Employee |  |  |  |  | 6

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