Segment Reporting and Significant Concentration - Summary of Revenues from Significant Clients (Details) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comcast
Segment Reporting Information [Line Items]
Revenue by Major Client, Percentage	23.00%	25.00%	28.00%
Charter
Segment Reporting Information [Line Items]
Revenue by Major Client, Percentage	20.00%	20.00%	22.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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