Segment Information (Segment Income Statement Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Operating Revenues	$ 7,894	$ 7,604	$ 15,648	$ 15,128
Cost of services and products	3,343	2,867	6,486	5,919
Selling, general and administration expense	5,594	5,262	10,649	10,960
Depreciation and amortization	1,250	919	2,492	1,822
Restructuring costs and other special charges				100
Total operating expenses	10,187	9,048	19,627	18,801
Operating loss	(2,293)	(1,444)	(3,979)	(3,673)
Interest income (expense), net	3	(54)	12	(193)
Income from investment		50,333		52,373
Other income (expense), net	(11)	6	1,490	27
(Loss) income before income taxes	(2,301)	48,841	(2,477)	48,534
Unified Communications [Member]
Segment Reporting Information [Line Items]
Operating Revenues	4,524	4,234	8,985	8,445
Cost of services and products	2,338	1,889	4,501	3,915
Selling, general and administration expense	3,614	3,351	6,737	7,012
Depreciation and amortization	867	539	1,727	1,060
Restructuring costs and other special charges				56
Total operating expenses	6,819	5,779	12,965	12,043
Operating loss	(2,295)	(1,545)	(3,980)	(3,598)
Telephone [Member]
Segment Reporting Information [Line Items]
Operating Revenues	3,370	3,370	6,663	6,683
Cost of services and products	1,005	978	1,985	2,004
Selling, general and administration expense	1,980	1,911	3,912	3,948
Depreciation and amortization	383	380	765	762
Restructuring costs and other special charges				44
Total operating expenses	3,368	3,269	6,662	6,758
Operating loss	$ 2	$ 101	$ 1	$ (75)