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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Cash flows from operating activities: |  |
Net income (loss) | $ (2,377,797) | $ (1,837,721)
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |
Depreciation | 237,934 | 231,491
Amortization of intangible assets | 530,234 | 667,954
Amortization of debt discount and deferred financing costs | 1,328,439 | 783,226
Share-based compensation | 2,487,239 | 1,086,200
Increase (decrease) in cash resulting from changes in: |  |
Accounts receivable | (4,108,313) | (2,054,414)
Inventory | (1,197,500) | (249,337)
Prepaid expenses | (721,223) | (127,559)
Other assets | 70,000 | 0
Accounts payable | 586,027 | (372,938)
Accrued compensation | 221,472 | 119,241
Accrued expenses | 85,219 | (84,939)
Accrued interest | (41,641) | 232,107
Other liabilities | 46,362 | 7,878
Net cash flows from operating activities | (2,853,548) | (1,598,811)
Cash flows from investing activities: |  |
Purchases of equipment | (1,052,930) | (238,498)
Patent application costs | (342,695) | 0
Net cash flows from investing activities | (1,395,625) | (238,498)
Cash flows from financing activities: |  |
Proceeds from exercise of warrants | 1,167,624 | 323,638
Proceeds from exercise of stock options | 542,841 | 315,295
Repayment of convertible debt related to acquisition | 0 | (250,000)
Principal payments of equipment leases | (22,194) | (9,256)
Net cash flows from financing activities | 1,688,271 | 379,677
Net change in cash | (2,560,902) | (1,457,632)
Cash and cash equivalents, beginning of period | 6,754,485 | 4,112,326
Cash and cash equivalents, end of period | $ 4,193,583 | $ 2,654,694

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