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Revenue and Accounts Receivable, Net - Trade Receivables Associated with Significant Customers (Details) - Comcast Corporation - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Revenue, Major Customer [Line Items] |  |
Accounts receivable, net | $ 25,022 | $ 19,782
Trade accounts receivable |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk percentage | 17.90% | 15.30%

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