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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating activities      
Net loss $ (2,422,361) $ (3,975,837) $ (7,888,804)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Stock-based compensation 723,199 676,554 715,086
Depreciation 336,996 459,686 503,983
Amortization of intangible assets 60,000 60,000 76,787
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(benefit) 31,940 15,515 (214,261)
Gain on sale of product line assets       (450,000)
Impairment charges       5,370,946
Changes in operating assets and liabilities:      
Accounts receivable (1,977,980) 845,814 1,675,278
Inventories 237,598 345,469 1,885,703
Prepaid expenses and other current assets (24,509) 340,507 (1,841)
Accounts payable and accrued expenses 90,991 868,031 (611,476)
Accrued payroll and related expenses (69,166) (172,604) 32,316
Deferred income on shipments to distributors 898,060 (244,272) (1,083,985)
Deferred service revenue (106,661) (65,722) 154,381
Change in deferred rent (14,007) 102,189 (17,777)
Net cash provided by (used in) operating activities (1,185,430) (638,521) 146,336
Investing activities      
Purchase of equipment and tooling (177,302) (143,559) (285,668)
Proceeds from sale of product line assets       450,000
Net cash provided by (used in) investing activities (177,302) (143,559) 164,332
Financing activities      
Payments on capital leases and equipment financing notes (13,073) (12,313) (11,405)
Proceeds from borrowings under bank line of credit agreement 2,033,111 5,609,560 8,684,054
Repayments of borrowings under bank line of credit agreement (923,511) (6,611,648) (8,687,757)
Proceeds from stock options exercised 29,739 27,816 2,665
Proceeds from warrants exercised 21,858      
Proceeds from issuance of senior convertible note and warrants    1,000,000   
Reduction (increase) in restricted cash requirement 710,797 (710,797) 0
Proceeds from the issuance of common stock and warrants       884,728
Net cash provided by financing activities 1,858,921 (697,382) 872,285
Net increase (decrease) in cash and cash equivalents 496,189 (1,479,462) 1,182,953
Cash and cash equivalents at beginning of year 460,833 1,940,295 757,342
Cash and cash equivalents at end of year 957,022 460,833 1,940,295
Supplemental cash flow information      
Cash paid for interest 66,036 190,278 225,132
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   
Warrants issued in conjunction with common stock financing       107,034
Addition of equipment under capital lease       $ 28,715