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Revenue and Accounts Receivable, Net - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 174,694 | $ 200,724 | $ 193,896 | $ 184,163 | $ 170,303 | $ 182,717 | $ 162,523 | $ 164,698 | $ 753,477 | $ 680,241 | $ 695,790
Comcast Corporation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 119,561 | $ 119,809 | $ 159,829
Concentration risk percentage |  |  |  |  |  |  |  |  | 15.90% | 17.60% | 23.00%
AT&T |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 77,888
Concentration risk percentage |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 11.20%

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