Revenue - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 83,742	$ 102,398	$ 209,677	$ 302,970
High Speed Products
Disaggregation of Revenue [Line Items]
Total revenue	78,383	94,532	196,688	277,245
Network Products and Solutions
Disaggregation of Revenue [Line Items]
Total revenue	$ 5,359	$ 7,866	$ 12,989	$ 25,725