Revenue - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 60,926	$ 97,401
High Speed Products
Disaggregation of Revenue [Line Items]
Total revenue	57,273	89,850
Network Products and Solutions
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,653	$ 7,551