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Condensed Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Sales |  |
Hardware | $ 292 | $ 338
Software | 74 | 102
Services and other | 1,041 | 1,333
Total sales | 1,407 | 1,773
Cost of sales |  |
Hardware | 192 | 189
Software | 8 | 31
Services and other | 461 | 604
Total cost of sales (exclusive of depreciation and amortization shown separately below) | 661 | 824
Gross profit | 746 | 949
Operating expenses: |  |
Sales and marketing expenses | 362 | 458
Research and development expenses | 318 | 559
General and administrative expenses | 1,410 | 1,676
Depreciation and amortization expense | 61 | 80
Total operating expenses | 2,151 | 2,773
Operating loss | (1,405) | (1,824)
Other income (expenses): |  |
Interest expense | (7) | (5)
Interest income |  | 1
Total other expense | (7) | (4)
Net loss | $ (1,412) | $ (1,828)
Basic and diluted loss per common share | $ (0.27) | $ (0.40)
Basic and diluted weighted average shares outstanding | 5,240 | 4,603

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