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Segment Information - Summary Financial Infomation by reportable segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2018 USD ($) segment | Sep. 29, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | $ 100,616 |  | $ 92,014 | $ 289,903 | $ 257,272
Gross Profit | 50,102 |  | 47,025 | 148,888 | 121,248
Operating Income (Loss) | (3,651) |  | (14,206) | $ (12,336) | (62,786)
Number of Reportable Segments | segment |  |  |  | 2 |
Video [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 73,344 | [1] | 84,155 | $ 224,300 | 231,876
Gross Profit | 41,937 | [1] | 48,283 | 126,721 | 126,776
Operating Income (Loss) | 5,258 | [1] | 7,009 | 13,492 | (7,774)
Cable Access [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 28,062 | [1] | 7,859 | 66,788 | 25,396
Gross Profit | 10,871 | [1] | 1,064 | 29,698 | 4,973
Operating Income (Loss) | 395 | [1] | (5,357) | (578) | (18,848)
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | 101,406 | [1] | 92,014 | 291,088 | 257,272
Gross Profit | 52,808 | [1] | 49,347 | 156,419 | 131,749
Operating Income (Loss) | $ 5,653 | [1] | 1,652 | $ 12,914 | (26,622)
Operating Income (Loss) [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  |  | $ 2,700 |  | $ 5,900
[1] | The Company has historically employed an aggregate allocation methodology based on total revenues to attribute professional services revenue and sales expenses between its Video and Cable Access segments. Beginning in the fourth quarter of 2017, the Company prospectively changed to a more precise attribution methodology as the activities of selling and supporting the CableOS solution have become increasingly distinct from those of Video solutions. The impact of making this change in the three and nine months ended September 29, 2017 compared to the Company’s historical approach was a decrease in operating income of $2.7 million and an increase in operating loss of $5.9 million, respectively, from the Video segment and a corresponding decrease in operating loss of the Cable Access segment. The Company believes that the updated allocation methodology will provide greater clarity regarding the operating metrics of the Video and Cable Access business segments.

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