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Employee Benefits Plans - Summary of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation | $ 12,074 | $ 17,289 | $ 16,610 | [1]
Cost of Sales [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation | 1,124 | 1,953 | 2,370 |
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation | 3,261 | 5,192 | 5,313 |
Selling General And Administrative Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation | 7,689 | 10,144 | 8,927 |
Operating expense [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation | $ 10,950 | $ 15,336 | $ 14,240 |
[1] | For the year ended December 31, 2017, the unallocated corporate expenses included acquisition- and integration-related costs, French VDP costs (see Note 11, “Restructuring and Related charges,” for more information on French VDP) and Cable Access product line inventory obsolescence costs, totaling $7.9 million. In addition, in fiscal 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 20, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.

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