Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue
Revenue	$ 87,822		$ 153,061
Percentage of Revenue	100.00%		100.00%
Data Center
Disaggregation of Revenue
Revenue	$ 69,040		$ 119,623
Percentage of Revenue	78.60%		78.20%
CATV
Disaggregation of Revenue
Revenue	$ 14,184		$ 24,752
Percentage of Revenue	16.20%		16.20%
Telecom
Disaggregation of Revenue
Revenue	$ 4,157		$ 7,743
Percentage of Revenue	4.70%		5.10%
FTTH
Disaggregation of Revenue
Revenue	$ 166		$ 277
Percentage of Revenue	0.20%		0.20%
Other
Disaggregation of Revenue
Revenue	$ 275		$ 666
Percentage of Revenue	0.30%		0.40%
Before Topic 606
Disaggregation of Revenue
Revenue		$ 117,371		$ 213,595
Percentage of Revenue		100.00%		100.00%
Before Topic 606 | Data Center
Disaggregation of Revenue
Revenue		$ 99,298		$ 178,892
Percentage of Revenue		84.60%		83.80%
Before Topic 606 | CATV
Disaggregation of Revenue
Revenue		$ 14,404		$ 27,498
Percentage of Revenue		12.30%		12.90%
Before Topic 606 | Telecom
Disaggregation of Revenue
Revenue		$ 3,077		$ 6,248
Percentage of Revenue		2.60%		2.90%
Before Topic 606 | FTTH
Disaggregation of Revenue
Revenue		$ 125		$ 223
Percentage of Revenue		0.10%		0.10%
Before Topic 606 | Other
Disaggregation of Revenue
Revenue		$ 467		$ 734
Percentage of Revenue		0.40%		0.30%