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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Operating activities:    
Net loss $ (2,392,574) $ (3,363,537)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 982,164 1,119,108
Share-based compensation 291,030 321,869
Loss on disposal of equipment 4,252  
Changes in assets and liabilities related to operations:    
Trade accounts receivable (152,805) (113,350)
Other receivables (13,455) 548
Inventories 199,728 487,672
Prepaid expenses and other assets 150,596 (44,540)
Accounts payable 355,283 (561,318)
Accrued expenses (23,723) (762,052)
Net cash used in operating activities (599,504) (2,915,600)
Investing activities:    
Acquisition of equipment and leasehold improvements (152,298) (85,987)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements (14,941) (52,444)
Net cash used in investing activities (167,239) (138,431)
Financing activities:    
Principal payment on capital leases (23,078) (748)
Proceeds from shareholder rights offering, net of costs 2,220,432  
Proceeds from exercise of stock options 0 4,080
Net cash provided by financing activities 2,197,354 3,332
Increase (decrease) in cash and cash equivalents 1,430,611 (3,050,699)
Cash and cash equivalents at beginning of period 2,693,623 5,744,322
Cash and cash equivalents at end of period 4,124,234 2,693,623
Supplemental cash flow information:    
Interest paid 7,120 4,012
Supplemental non-cash investing and financing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 20,404 14,941
Capital lease obligations incurred in the purchase of equipment $ 120,359