Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Summary of Significant Accounting Policies (Textual)
Amortization expense for intangible assets	$ 171	$ 171
Intangible asset amortization in 2018	171
Intangible asset amortization in 2019	171
Intangible asset amortization in 2020	171
Intangible asset amortization in 2021	171
Intangible asset amortization in 2022	14
Intangible asset amortization thereafter	$ 2
Percentage of employees were covered by collective bargaining arrangement	28.00%
Royalty expense	$ 77	150
Amortization expense	$ 321	$ 532
Stock reissued from treasury	92,000	1,358,000
Stock options [Member]
Summary of Significant Accounting Policies (Textual)
Incremental shares	1,256	1,156,000
Convertible debt [Member]
Summary of Significant Accounting Policies (Textual)
Incremental shares	1,670,000	1,026,000
Customer relationships [Member]
Summary of Significant Accounting Policies (Textual)
Intangible assets estimated useful lives, amortization	10 years.
Proprietary technology [Member]
Summary of Significant Accounting Policies (Textual)
Intangible assets estimated useful lives, amortization	10 years.
Non-compete agreements [Member]
Summary of Significant Accounting Policies (Textual)
Intangible assets estimated useful lives, amortization	3 years.
Analog Video Headend Products [Member]
Summary of Significant Accounting Policies (Textual)
Concentration risk, percentage	8.00%	10.00%
Digital Video Headend Products [Member]
Summary of Significant Accounting Policies (Textual)
Concentration risk, percentage	41.00%	52.00%
Office equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	3 years
Office equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	5 years
Furniture and fixtures [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	5 years
Furniture and fixtures [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	7 years
Machinery and equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	6 years
Machinery and equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	10 years
Building improvements [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	10 years
Building improvements [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	15 years
Manufacturing and administrative office facility [Member]
Summary of Significant Accounting Policies (Textual)
Property, plant and equipment, estimated useful lives	40 years
License [Member]
Summary of Significant Accounting Policies (Textual)
Intangible asset amortization in 2018	$ 29
Intangible asset amortization in 2019	29
Amortization expense	$ 150	$ 361
License [Member] | Minimum [Member]
Summary of Significant Accounting Policies (Textual)
Amortization of license fees, estimated useful life	1 year
License [Member] | Maximum [Member]
Summary of Significant Accounting Policies (Textual)
Amortization of license fees, estimated useful life	2 years