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Basis of Presentation (Details Textual) (USD $)
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3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||
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Dec. 31, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2013
employees
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Mar. 31, 2012
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Mar. 31, 2011
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May 15, 2012
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Mar. 31, 2013
Kentrox [Member]
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Apr. 01, 2013
Kentrox [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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Mar. 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, 2013
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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Mar. 31, 2013
ANTONE Wireless Corporation [Member]
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May 15, 2012
ANTONE Wireless Corporation [Member]
employees
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Mar. 31, 2013
Technology [Member]
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May 15, 2012
Technology [Member]
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Mar. 31, 2013
Customer Relationships [Member]
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May 15, 2012
Customer Relationships [Member]
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| Business Acquisition [Line Items] | |||||||||||||||||||||||||
| Number of employees affected by planned relocation | 35 | ||||||||||||||||||||||||
| Cash consideration transferred for business acquisition | $ 2,524,000 | $ 30,000,000 | $ 2,500,000 | ||||||||||||||||||||||
| Business Combination, Acquisition Related Costs | 300,000 | 0 | |||||||||||||||||||||||
| Contingent cash consideration | 3,500,000 | 3,500,000 | |||||||||||||||||||||||
| Number of Employees Hired | 9 | ||||||||||||||||||||||||
| Acquired intangible assets from ANTONE | 3,230,000 | 2,800,000 | 400,000 | ||||||||||||||||||||||
| Estimated useful lives for acquired intangible assets | 8 years | 8 years | |||||||||||||||||||||||
| Business Acquisition, Purchase Price Allocation, Goodwill Amount | 2,086,000 | ||||||||||||||||||||||||
| Warranty obligation for pre-acquisition sales made by ANTONE | 303,000 | 303,000 | |||||||||||||||||||||||
| Pre-acquisition warranty costs | 25,000 | ||||||||||||||||||||||||
| Sale of conference plus | 40,300,000 | ||||||||||||||||||||||||
| Escrow deposit made | 3,000 | 4,100,000 | 3,400,000 | ||||||||||||||||||||||
| Loss Contingency, Loss in Period | 900,000 | 1,500,000 | |||||||||||||||||||||||
| Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | (1,358,000) | 3,509,000 | 4,868,000 | ||||||||||||||||||||||
| Escrow Deposit Released | 1,600,000 | 2,600,000 | |||||||||||||||||||||||
| Gain (Loss) on Sale of Business | 20,489,000 | 20,489,000 | |||||||||||||||||||||||
| Proceeds from CNS asset sale | 36,729,000 | 36,700,000 | |||||||||||||||||||||||
| Litigation Settlement, Gross | 900,000 | ||||||||||||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 800,000 | 1,700,000 | 800,000 | 400,000 | |||||||||||||||||||||
| Additional expense related to CNS claim | 500,000 | ||||||||||||||||||||||||
| Payments for Legal Settlements | 900,000 | ||||||||||||||||||||||||
| Pre-tax gain on CNS asset sale | $ 0 | $ 0 | $ 46,000 | $ 31,608,000 | $ 31,654,000 | $ 32,848,000 | $ 31,654,000 | ||||||||||||||||||