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Revenue - Revenue by Product Group (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Total revenue $ 91,104 $ 81,748 $ 81,102 $ 68,586 $ 76,871 $ 71,121 $ 73,214 $ 71,688 $ 322,540 $ 292,894 $ 411,423
High Speed Products                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 275,803 241,780 277,258
Network Products and Solutions                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 $ 46,737 $ 51,114 $ 134,165