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Note 2 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended
March 31,
 
   
2013
   
2012
 
Basic and diluted loss per share:
           
Net loss
  $ (1,428 )   $ (1,867 )
                 
Basic and diluted loss per share:
               
Weighted average shares outstanding
    44,699       31,621  
                 
Basic and diluted net loss per share
  $ (0.03 )   $ (0.06 )
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three months ended
March 31,
 
   
2013
   
2012
 
             
Research and development
  $ 7     $ 6  
Sales and marketing
    8       8  
General and administrative
    30       44  
Total stock-based compensation
  $ 45     $ 58  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three months ended
March 31,
 
   
2013
   
2012
 
             
Fair value of options issued
  $ 0.15     $ 0.21  
Exercise price
  $ 0.23     $ 0.39  
Expected life of option (years)
 
8.3
   
6.1
 
Risk-free interest rate
    1.57 %     1.48 %
Expected volatility
    83.82 %     58.05 %
Dividend yield
    0 %     0 %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Options
   
Weighted Average Exercise Price
   
Weighted Average Remaining Contractural Term (in Years)
 
Outstanding as of December 31, 2012
    2,184,583     $ 2.20        
Granted
    1,052,500     $ 0.23        
Exercised
    -     $ -        
Cancelled/forfeited
    (25,200 )   $ 2.65        
Outstanding as of March 31, 2013
    3,211,883     $ 1.55       7.6  
Exercisable as of March 31, 2013
    1,565,450     $ 2.74       5.9  
Schedule of Product Warranty Liability [Table Text Block]
   
Three months ended
March 31,
 
   
2013
   
2012
 
             
Balance at the beginning of the period
  $ 159     $ 100  
Accruals for warranties issued
    16       31  
Settlements made during the period (in cash or in kind)
    (35 )     (21 )
Balance at the end of the period
  $ 140     $ 110