Accounts Receivable, Net and Revenue Concentrations - Net Sales to Significant Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 200,724	$ 182,717	$ 578,783	$ 509,938
Net Sales | Comcast Corporation
Revenue, Major Customer [Line Items]
Net sales	$ 30,419	$ 32,336	$ 91,058	$ 99,853
Percent of net sales	15.20%	17.70%	15.70%	19.60%
Net Sales | Ring L.L.C.
Revenue, Major Customer [Line Items]
Net sales	$ 21,050	$ 0
Percent of net sales	10.50%	0.00%