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Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities:    
Net loss $ (1,810,895) $ (2,093,222)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 749,666 845,207
Stock compensation expense 222,673 251,518
Changes in assets and liabilities related to operations:    
Trade accounts receivable 8,940 (327,069)
Other receivables 13,712 (76,860)
Inventories 46,221 140,859
Prepaid expenses and other current assets 123,120 (73,283)
Accounts payable 289,032 (334,392)
Accrued expenses 87,742 (650,307)
Deferred other revenue 67,998  
Net cash used in operating activities (201,791) (2,317,549)
Investing activities:    
Acquisition of equipment and leasehold improvements (116,969) (61,221)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements (14,941) (52,444)
Net cash used in investing activities (131,910) (113,665)
Financing activities:    
Principal payments on capital leases (14,796) (748)
Proceeds from stockholder rights offering, net of costs 2,220,432  
Proceeds from exercise of stock options   4,080
Net cash provided by financing activities 2,205,636 3,332
Increase (decrease) in cash and cash equivalents 1,871,935 (2,427,882)
Cash and cash equivalents at beginning of period 2,693,623 5,744,322
Cash and cash equivalents at end of period 4,565,558 3,316,440
Supplemental cash flow information:    
Interest paid 5,093 3,763
Supplemental non-cash investing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 11,677 18,261
Capital lease obligation in the purchase of equipment $ 120,359