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Consolidated Statements of Cash Flows - Suppplemental Cash Flow Disclosure (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Other Significant Noncash Transactions [Line Items] |  |
Property and equipment | $ 150 | $ 0
Total Non-cash Transactions | 0 | 4,632
VCON Video Conferencing, Ltd. (VCON) |  |
Other Significant Noncash Transactions [Line Items] |  |
Inventory | 0 | 40
Property and equipment | 0 | 34
Product warranty liability | 0 | (8)
Proprietary software | 0 | 2,247
Goodwill | $ 0 | $ 2,319

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