Basis of Presentation and Description of Company (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 29, 2018 |
Sep. 30, 2017 |
Sep. 29, 2018 |
Sep. 30, 2017 |
Dec. 30, 2017 |
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| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | |||||
| Net income | $ 438 | $ 919 | $ 688 | $ 28,094 | |
| Cumulative effect adjustment | $ (132,174) | $ (132,174) | $ (132,996) | ||
| Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | |||||
| Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | |||||
| Cumulative effect adjustment | $ 342 | ||||
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