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Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities |  |  |
Net loss | $ (3,298,082) | $ (2,422,361) | $ (3,975,837)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Stock-based compensation | 597,668 | 723,199 | 676,554
Depreciation | 264,512 | 336,996 | 459,686
Amortization of intangible assets | 60,000 | 60,000 | 60,000
Issuance of common stock warrant for services |  |  | 50,500
Amortization of debt discount to interest expense |  | 944,351 | 55,649
Interest expense related to premium for conversion of convertible note |  | 89,387 |
Interest expense on convertible note settled with common stock |  | 16,732 |
Deferred tax expense | 31,940 | 31,940 | 15,515
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 1,282,455 | (1,977,980) | 845,814
Inventories | 519,985 | 237,598 | 345,469
Prepaid expenses and other current assets | 77,986 | (24,509) | 340,507
Accounts payable and accrued expenses | 410,445 | 90,991 | 868,031
Accrued payroll and related expenses | (86,896) | (69,166) | (172,604)
Deferred income on shipments to distributors | (717,385) | 898,060 | (244,272)
Deferred service revenue | (46,236) | (106,661) | (65,722)
Change in deferred rent | (3,853) | (14,007) | 102,189
Net cash used in operating activities | (907,461) | (1,185,430) | (638,521)
Investing activities |  |  |
Purchase of equipment and tooling | (234,856) | (177,302) | (143,559)
Net cash used in investing activities | (234,856) | (177,302) | (143,559)
Financing activities |  |  |
Payments on capital leases and equipment financing notes | (14,581) | (13,073) | (12,313)
Proceeds from borrowings under bank line of credit agreement | 6,438,779 | 2,033,111 | 5,609,560
Repayments of borrowings under bank line of credit agreement | (6,737,693) | (923,511) | (6,611,648)
Proceeds from stock options exercised | 14,015 | 29,739 | 27,816
Proceeds from warrants exercised | 29,999 | 21,858 |
Proceeds from issuance of related party subordinated convertible notes payable | 750,000 |  |
Proceeds from issuance of short term note payable | 400,000 |  |
Repayments of short term note payable | (304,711) |  |
Proceeds from issuance of senior convertible note and warrants |  |  | 1,000,000
Reduction (increase) in restricted cash requirement |  | 710,797 | (710,797)
Net cash provided by (used in) financing activities | 575,808 | 1,858,921 | (697,382)
Net increase (decrease) in cash and cash equivalents | (566,509) | 496,189 | (1,479,462)
Cash and cash equivalents at beginning of year | 957,022 | 460,833 | 1,940,295
Cash and cash equivalents at end of year | 390,513 | 957,022 | 460,833
Supplemental cash flow information |  |  |
Cash paid for interest | 224,775 | 66,036 | 190,278
Non-cash investing and financing activities: |  |  |
Issuance of common stock in exchange for forgiveness of accounts payable |  | 499,998 |
Conversion of senior convertible note and accrued interest to common stock |  | 1,106,119 |
Beneficial conversion feature associated with senior convertible note |  | 273,904 | 390,548
Warrants issued in conjunction with senior convertible note |  |  | $ 335,548

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