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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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 156,264	$ 153,505	$ 153,133	$ 151,778	$ 174,694	$ 200,724	$ 193,896	$ 184,163	$ 614,680	$ 753,477	$ 680,241
Comcast Corporation
Revenue, Major Customer [Line Items]
Net sales									$ 123,574	$ 119,561	$ 119,809
Comcast Corporation | Customer concentration risk | Revenue from contract with customer benchmark
Revenue, Major Customer [Line Items]
Concentration risk percentage									20.10%	15.90%	17.60%

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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.

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