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Accrued liabilities - Note 6
12 Months Ended
Dec. 31, 2011
Notes to Financial Statements  
Accrued liabilities - Note 6

6. Accrued liabilities

Accrued liabilities consist of the following:

            December 31,
            2011     2010
Bonuses         $ 1,214,000    $ 649,000 
Payroll and payroll taxes           590,000      629,000 
Compensated absences           508,000      647,000 
Deferred rent credit           261,000      373,000 
Warranty           490,000      227,000 
Adverse purchase commitments                                   134,000      341,000 
Accelerated rent expense           402,000      - 
Professional fees           415,000      391,000 
Purchased patents           330,000      220,000 
Other           769,000      658,000 
          $ 5,113,000    $ 4,135,000