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STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities:    
Net loss $ (1,568,670) $ (1,810,895)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 674,082 749,666
Stock compensation expense 191,872 222,673
Gain on disposal of equipment (18,001)  
Allowance for excess inventory quantities 47,017  
Changes in assets and liabilities related to operations:    
Trade accounts receivable 43,101 8,940
Other receivables 26,323 13,712
Inventories 100,709 46,221
Prepaid expenses and other current assets 13,976 123,120
Accounts payable (168,920) 289,032
Accrued expenses 67,268 87,742
Deferred other revenue    67,998
Net cash used in operating activities (591,243) (201,791)
Investing activities:    
Proceeds from disposal of equipment 18,001  
Acquisition of equipment and leasehold improvements (177,652) (116,969)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements (20,404) (14,941)
Net cash used in investing activities (180,055) (131,910)
Financing activities:    
Principal payments on capital leases (48,832) (14,796)
Proceeds from stockholder rights offering, net of costs    2,220,432
Proceeds from exercise of stock options 3,000  
Net cash (used in) / provided by financing activities (45,832) 2,205,636
(Decrease) / increase in cash and cash equivalents (817,130) 1,871,935
Cash and cash equivalents at beginning of period 4,124,234 2,693,623
Cash and cash equivalents at end of period 3,307,104 4,565,558
Supplemental cash flow information:    
Interest paid 10,748 5,093
Supplemental non-cash investing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 92,296 11,677
Capital lease obligations incurred in the purchase of equipment    $ 120,359