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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