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Basis of Presentation (Details Textual) (USD $)
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3 Months Ended | 3 Months Ended | 12 Months Ended | 9 Months Ended | |||||||||
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Sep. 30, 2013
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Mar. 31, 2013
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Sep. 30, 2013
Sale of Conference Plus, Inc [Member]
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Jun. 30, 2013
Sale of Conference Plus, Inc [Member]
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Mar. 31, 2013
Sale of Conference Plus, Inc [Member]
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Dec. 31, 2012
Sale of Conference Plus, Inc [Member]
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Dec. 31, 2011
Sale of Conference Plus, Inc [Member]
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Dec. 31, 2012
Sale of Customer Networking Solutions Assets [Member]
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Sep. 30, 2012
Sale of Customer Networking Solutions Assets [Member]
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Mar. 31, 2012
Sale of Customer Networking Solutions Assets [Member]
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Apr. 02, 2013
Kentrox [Member]
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Sep. 30, 2013
Westell [Member]
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Sep. 30, 2013
Arkadin [Member]
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| Business Acquisition [Line Items] | |||||||||||||
| Equity Method Investment, Ownership Percentage | 100.00% | ||||||||||||
| Sale of conference plus | $ 40,300,000 | ||||||||||||
| Escrow deposit made | 4,100,000 | ||||||||||||
| DISCO Loss Contingency, Loss in Period | 1,500,000 | ||||||||||||
| Escrow Deposit Released | 1,500,000 | 500,000 | 1,600,000 | 2,800,000 | 800,000 | ||||||||
| Proceeds from CNS asset sale | 36,700,000 | ||||||||||||
| Litigation Settlement, Gross | 900,000 | ||||||||||||
| Loss Contingency Accrual, at Carrying Value | 900,000 | 1,700,000 | 400,000 | ||||||||||
| Additional expense related to CNS claim | 500,000 | ||||||||||||
| Unrecognized Tax Benefits | $ 2,700,000 | ||||||||||||