Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Intangible assets, gross	$ 19,726	$ 19,957
Less accumulated amortization	(11,843)	(11,550)
Intangible assets, net	7,883	8,407
Horizon Software [Member]
Intangible assets, gross	18,400	18,634
ZTEsoft Telecom Software [Member]
Intangible assets, gross	441	438
Contractual Relationships [Member]
Intangible assets, gross	$ 885	$ 885

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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