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Balance Sheet Components Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 25, 2020 | Dec. 31, 2019
Property and Equipment, Gross | $ 150,304 | $ 136,131
TVN [Member] |  |
French R&D tax credits receivable, noncurrent | $ 19,500 |
TVN [Member] | Research Tax Credit Carryforward [Member] |  |
The number of years R&D tax credits can be used to offset against income tax payable after incurred | 4 years |
Other Noncurrent Assets [Member] | TVN [Member] | Research Tax Credit Carryforward [Member] |  |
French R&D tax credits receivable, noncurrent | $ 19,500 |
Leasehold Improvements [Member] |  |
Property and Equipment, Gross | 37,436 | $ 15,170
Leasehold Improvements [Member] | Harmonic Headquarter Lease Commencing May 2019 [Member] |  |
Property and Equipment, Gross | $ 22,900 |

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