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Goodwill and Identified Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | (in thousands):
|  | Video |  | Cable Access |  | Total
Balance as of December 31, 2017 |  | $ | 182,012 |  |  | $ | 60,815 |  |  | $ | 242,827 |
Foreign currency translation adjustment |  | (2,173 | ) |  | (36 | ) |  | (2,209 | )
Balance as of December 31, 2018 |  | $ | 179,839 |  |  | $ | 60,779 |  |  | $ | 240,618 |
Foreign currency translation adjustment |  | (857 | ) |  | 19 |  |  | (838 | )
Balance as of December 31, 2019 |  | $ | 178,982 |  |  | $ | 60,798 |  |  | $ | 239,780 |
Summary of Identified Intangible Assets | The following table provides a summary of the Company’s identified intangible assets (in thousands):
|  |  | December 31, 2019 |  | December 31, 2018
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | 0.2 |  | $ | 31,707 |  |  | $ | (30,757 | ) |  | $ | 950 |  |  | $ | 31,707 |  |  | $ | (25,576 | ) |  | $ | 6,131 |
Customer relationships/contracts | 1.2 |  | 44,577 |  |  | (41,092 | ) |  | 3,485 |  |  | 44,650 |  |  | (38,146 | ) |  | 6,504 |
Trademarks and tradenames | 0.2 |  | 609 |  |  | (583 | ) |  | 26 |  |  | 623 |  |  | (441 | ) |  | 182 |
Maintenance agreements and related relationships | N/A |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order Backlog | N/A |  | 3,085 |  |  | (3,085 | ) |  | — |  |  | 3,112 |  |  | (3,112 | ) |  | — |
Total identifiable intangibles |  |  | $ | 85,478 |  |  | $ | (81,017 | ) |  | $ | 4,461 |  |  | $ | 85,592 |  |  | $ | (72,775 | ) |  | $ | 12,817 |
Purchased Intangibles Amortization Expense Allocation | Amortization expense for the identifiable intangible assets was allocated as follows (in thousands):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Included in cost of revenue | $ | 5,180 |  |  | $ | 5,180 |  |  | $ | 5,180 |
Included in operating expenses | 3,139 |  |  | 3,187 |  |  | 3,142 |
Total amortization expense | $ | 8,319 |  |  | $ | 8,367 |  |  | $ | 8,322 |
Schedule of Finite-Lived Intangible Assets, Estimated Future Amortization Expense | The estimated future amortization expense of identifiable intangible assets with definite lives as of December 31, 2019 is as follows (in thousands):
| Cost of Revenue |  | Operating Expenses |  | Total
Year ended December 31, |  |  |  |  |
2020 | $ | 951 |  |  | $ | 3,012 |  |  | $ | 3,963 |
2021 | — |  |  | 498 |  |  | 498 |
Total future amortization expense | $ | 951 |  |  | $ | 3,510 |  |  | $ | 4,461 |

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