The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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-Name Accounting Standards Codification

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Income Tax Expense (or Benefit)

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The net result for the period of deducting operating expenses from operating revenues.

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Segment Reporting and Geographic Information (Statement of Operations Information by Business Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gross profit
Gross profit	$ 13,029us-gaap_GrossProfit	$ 14,716us-gaap_GrossProfit	$ 14,782us-gaap_GrossProfit	$ 13,251us-gaap_GrossProfit	$ 16,620us-gaap_GrossProfit	$ 14,974us-gaap_GrossProfit	$ 13,372us-gaap_GrossProfit	$ 13,027us-gaap_GrossProfit	$ 55,778us-gaap_GrossProfit	$ 57,993us-gaap_GrossProfit	$ 55,152us-gaap_GrossProfit
Depreciation expense
Depreciation expense									2,097us-gaap_Depreciation	1,833us-gaap_Depreciation	1,448us-gaap_Depreciation
Operating income (loss)
Operating loss	(2,351)us-gaap_OperatingIncomeLoss	(424)us-gaap_OperatingIncomeLoss	(1,126)us-gaap_OperatingIncomeLoss	(3,849)us-gaap_OperatingIncomeLoss	128us-gaap_OperatingIncomeLoss	39us-gaap_OperatingIncomeLoss	(535)us-gaap_OperatingIncomeLoss	(4,013)us-gaap_OperatingIncomeLoss	(7,750)us-gaap_OperatingIncomeLoss	(4,381)us-gaap_OperatingIncomeLoss	(9,847)us-gaap_OperatingIncomeLoss
Provision (benefit) for income taxes	2,644us-gaap_IncomeTaxExpenseBenefit	727us-gaap_IncomeTaxExpenseBenefit	681us-gaap_IncomeTaxExpenseBenefit	251us-gaap_IncomeTaxExpenseBenefit	1,075us-gaap_IncomeTaxExpenseBenefit	12us-gaap_IncomeTaxExpenseBenefit	115us-gaap_IncomeTaxExpenseBenefit	306us-gaap_IncomeTaxExpenseBenefit	4,303us-gaap_IncomeTaxExpenseBenefit	1,508us-gaap_IncomeTaxExpenseBenefit	(1,013)us-gaap_IncomeTaxExpenseBenefit
Operating Segments [Member]
Gross profit
Gross profit									55,777	57,986	55,157
Operating income (loss)
Operating loss									(1,512)	2,921	5,610
Network Equipment segment [Member]
Gross profit
Gross profit									42,601	47,069	43,325
Depreciation expense
Depreciation expense									1,759	1,417	1,022
Operating income (loss)
Operating loss									(7,074)	(1,699)	1,096
Provision (benefit) for income taxes									1,873	(38)	(2,468)
Network Integration segment [Member]
Gross profit
Gross profit									13,176	10,917	11,832
Depreciation expense
Depreciation expense									204	219	234
Operating income (loss)
Operating loss									5,562	4,620	4,514
Provision (benefit) for income taxes									2,430	1,546	1,455
Corporate Unallocated and Intersegment Adjustments [Member]
Gross profit
Gross profit									1	7	(5)
Operating income (loss)
Operating loss									(6,238)	(7,302)	(15,457)
Corporate [Member]
Depreciation expense
Depreciation expense									$ 134	$ 197	$ 192