Acquisition of TelWorx Communications LLC (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Tangible assets:
Inventory	$ 16,848	$ 17,573
Prepaid expenses	1,220	2,160
TelWorx Communications LLC [Member]
Tangible assets:
Accounts receivable		1,370
Inventory		1,378
Prepaid expenses		9
Fixed assets		248
Total tangible assets		3,005
Intangible assets:
Total intangible assets		14,443
Total assets		17,448
Capital leases		37
Accounts payable		1,213
Accrued liabilities		118
Total liabilities		1,368
Net assets acquired		16,080
Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Tangible assets:
Accounts receivable		1,575
Inventory		1,843
Prepaid expenses		9
Fixed assets		248
Total tangible assets		3,675
Intangible assets:
Total intangible assets		14,727
Total assets		18,402
Capital leases		57
Accounts payable		1,113
Accrued liabilities		85
Total liabilities		1,255
Net assets acquired		17,147
Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Tangible assets:
Accounts receivable		(205)
Inventory		(465)
Prepaid expenses		0
Fixed assets		0
Total tangible assets		(670)
Intangible assets:
Total intangible assets		(284)
Total assets		(954)
Capital leases		(20)
Accounts payable		100
Accrued liabilities		33
Total liabilities		113
Net assets acquired		(1,067)
Goodwill [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Goodwill		12,550
Goodwill [Member] \| Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Goodwill		9,491
Goodwill [Member] \| Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Goodwill		3,059
Trade names [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		1,259
Trade names [Member] \| Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		1,527
Trade names [Member] \| Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		(268)
Technology [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		470
Technology [Member] \| Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		458
Technology [Member] \| Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		12
Customer relationships [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		117
Customer relationships [Member] \| Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		2,898
Customer relationships [Member] \| Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		(2,781)
Backlog [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		33
Backlog [Member] \| Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		91
Backlog [Member] \| Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		(58)
Non-compete [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		14
Non-compete [Member] \| Estimated Fair Value [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		262
Non-compete [Member] \| Provisional Adjustments [Member] \| TelWorx Communications LLC [Member]
Intangible assets:
Intangible assets, net		$ (248)

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The amount of acquisition cost of a business combination allocated to assets acquired.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to capital lease obligations assumed from the acquired entity.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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