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Condensed Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities    
Net loss $ (2,609,997) $ (2,047,806)
Stock-based compensation 469,117 548,838
Depreciation and amortization 255,331 302,319
Amortization of debt discount to interest expense     
Interest expense related to premium for conversion of convertible note    89,387
Interest expense on convertible note settled with common stock    16,732
Deferred income tax expense 23,955 23,955
Changes in operating assets and liabilities:    
Accounts receivable 1,503,014 (1,801,128)
Inventories 266,992 411,222
Prepaid expenses and other current assets 52,584 (64,065)
Other assets (1,442) 60,388
Accounts payable 18,579 838,012
Accrued payroll and related expenses (37,717) 53,636
Deferred income on shipments to distributors (578,088) 497,119
Deferred service revenue (24,821) (74,101)
Change in deferred rent (5,949) (9,986)
Net cash used in operating activities (668,442) (211,127)
Investing activities    
Purchases of equipment (224,005) (95,027)
Net cash used in investing activities (224,005) (95,027)
Financing activities    
Payments on capital leases (10,366) (9,731)
Reduction in restricted cash requirement    710,797
Proceeds from borrowings under bank line of credit agreement 5,158,618   
Repayments of borrowings under bank line of credit agreement (5,613,470)   
Stock options exercised 14,015 29,739
Warrants exercised 29,999 21,858
Proceeds from the issuance of convertible note payable 400,000   
Proceeds from the issuance of short term note payable 400,000   
Repayments of short term note payable (36,160)   
Net cash provided by financing activities 342,636 752,663
Net increase (decrease) in cash and cash equivalents (549,811) 446,509
Cash and cash equivalents at beginning of period 957,022 460,833
Cash and cash equivalents at end of period 407,211 907,342
Supplemental cash flow information    
Cash paid for interest 129,968 52,135
Issuance of common stock in exchange for forgiveness of accounts payable    499,998
Beneficial conversion feature associated with senior convertible note    273,904
Conversion of senior convertible note and accrued interest to common stock    $ 1,016,732