Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 24, 2016 |
Sep. 30, 2017 |
Sep. 24, 2016 |
Jan. 01, 2017 |
|
| Operating Loss Carryforwards [Line Items] | |||||
| Income tax expense (benefit) | $ (647) | $ 332 | $ (1,503) | $ 952 | |
| Foreign Tax Authority | |||||
| Operating Loss Carryforwards [Line Items] | |||||
| Operating loss carryforwards | $ 2,200 | ||||
| State and Local Jurisdiction | |||||
| Operating Loss Carryforwards [Line Items] | |||||
| Operating loss carryforwards | $ 1,900 | ||||