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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net loss | $ (5,709) | $ (6,055) | $ (8,517)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Loss on impairment | 672 |  | 156
Depreciation | 637 | 589 | 790
Stock-based compensation | 200 | 426 | 878
Valuation of equity instruments |  | 56 | 1,812
Provision for doubtful accounts receivable | 147 | 115 | 44
Amortization of intangible assets | 419 | 649 | 1,073
Amortization of discounts on long-term borrowings | 236 | 574 | 349
Amortization of loan origination fees | 113 |  |
Deferred revenue | (311) | 16 | 1,215
Change in estimate of contingent liabilities | (102) | (411) |
(Gain) loss on disposal of property and equipment | (3) | (11) | (22)
Changes in assets and liabilities: |  |  |
Accounts receivable, inventories, and other assets | (3,158) | 3,411 | (1,694)
Accounts payable and accrued liabilities | (107) | (1,976) | 5,409
Total adjustments | (1,257) | 3,438 | 10,010
Net cash (used in) provided by operating activities | (6,966) | (2,617) | 1,493
Cash flows from investing activities: |  |  |
Proceeds from the sale of property and equipment | 3 | 19 | 50
Acquisition of property and equipment | (332) | (256) | (332)
Net cash used in investing activities | (329) | (237) | (282)
Cash flows from financing activities: |  |  |
Proceeds from issuances of common stock, net | 4,826 | 456 | 669
Proceeds from exercise of stock options |  | 5 | 8
Proceeds from other borrowings | 1,500 | 605 | 1,150
Payments on other borrowings | (886) | (892) |
Net proceeds on credit line borrowings | 889 | 701 |
Net cash provided by financing activities | 6,329 | 875 | 1,827
Effect of exchange rate changes on cash | 11 | 8 | 7
Net (decrease) increase in cash and cash equivalents | (955) | (1,971) | 3,045
Cash and cash equivalents at beginning of year | 2,136 | 4,107 | 1,062
Cash and cash equivalents at end of period | 1,181 | 2,136 | 4,107
Classification of cash and cash equivalents: |  |  |
Cash and cash equivalents | 929 | 2,117 | 3,979
Restricted cash held | 252 | 19 | 128
Interest paid | 186 | 328 | 171
Non-cash investing and financing activities: |  |  |
Fully depreciated assets disposed of | $ 2 | $ 1,050 | $ 1,548

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