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Principles of Consolidation (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 20, 2018 | May 03, 2017 | Apr. 13, 2016 | Dec. 30, 2017 | Jul. 01, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Sale of GNU interest |  |  |  |  |  |  |
Purchase price received |  |  |  |  |  |  | $ 250
GNU gain on sale of business assets |  |  |  |  |  |  | $ 250
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |
Purchase price |  |  | $ 1,350 |  |  |  |
Purchase price received |  | $ 250 | $ 1,100 |  |  |  |
GNU gain on sale of business assets |  |  |  |  | $ 140 |  |
GNU partial distribution gain received on sale of business assets | $ 60 |  |  | $ 600 |  |  |
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |
GNU gain on sale of business assets |  |  |  |  | $ 250 |  |
GNU |  |  |  |  |  |  |
GNU Interest |  |  |  |  |  |  |
Percentage of ownership interest held by the entity |  |  |  |  |  | 55.89% |

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