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Commitments and Contingencies (Details) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 17, 2018 USD ($) | Jun. 21, 2018 patent | Jul. 16, 2014 patent | Jan. 28, 2014 patent | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases |  |  |  |  |  |  |
Rent expense under operating leases |  |  |  |  | $ 6,000 | $ 5,500 | $ 4,700
Minimum annual future rentals |  |  |  |  |  |  |
2019 |  |  |  |  | 5,287 |  |
2020 |  |  |  |  | 4,746 |  |
2021 |  |  |  |  | 4,051 |  |
2022 |  |  |  |  | 3,485 |  |
2023 |  |  |  |  | 2,810 |  |
Thereafter |  |  |  |  | 3,842 |  |
Total minimum lease payments |  |  |  |  | 24,221 |  |
Investment Commitment |  |  |  |  |  |  |
Investment Funded |  |  |  |  | 4,300 |  |
Patent Litigation |  |  |  |  |  |  |
Payment for settlement of litigation | $ 0 |  |  |  |  |  |
High end of range |  |  |  |  |  |  |
Investment Commitment |  |  |  |  |  |  |
Commitment to invest in limited partnership |  |  |  |  | $ 10,000 |  |
Cresta Technology |  |  |  |  |  |  |
Patent Litigation |  |  |  |  |  |  |
Number of patents allegedly infringed | patent |  |  | 6 | 3 |  |  |
Bandspeed |  |  |  |  |  |  |
Patent Litigation |  |  |  |  |  |  |
Number of patents allegedly infringed | patent |  | 8 |  |  |  |  |

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