Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	$ 5,363	$ 5,973
Digital video headend products [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	2,543
Data products [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	1,399
HFC distribution products [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	741
Analog video headend products [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	330
Contract manufactured products [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	224
Other [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Disaggregated revenues	$ 126