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The Company and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2012
The Company and Summary of Significant Accounting Policies [Abstract]  
Sales by geographic area
                                 
    Three Months Ended September 30,     Nine Months Ended September 30,  
    2012     2011     2012     2011  

United States

    81     81     83     78

Other Countries

    19       19       17       22  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total

    100     100     100     100
   

 

 

   

 

 

   

 

 

   

 

 

 
Weighted average number of shares outstanding and income (loss) per share
                                 
    Three Months Ended September 30,     Nine Months Ended September 30,  
    2012     2011     2012     2011  

Numerator for basic and diluted income per share

                               

Net income (loss)

  $ 3,676,872     $ 1,136,285     $ 10,922,936     $ (1,138,815
   

 

 

   

 

 

   

 

 

   

 

 

 

Denominator for basic income per share - weighted average shares outstanding

    52,509,068       58,787,274       57,997,341       60,617,787  

Dilutive effect of restricted stock units

    84,241       —         33,380       —    

Dilutive effect of shares issuable under stock options outstanding

    513,016       1,250,054       452,112       —    
   

 

 

   

 

 

   

 

 

   

 

 

 

Denominator for diluted income per share - adjusted weighted average shares outstanding

    53,106,325       60,037,328       58,482,833       60,617,787  
   

 

 

   

 

 

   

 

 

   

 

 

 

Net income (loss) per common share:

                               

Basic

  $ 0.07     $ 0.02     $ 0.19     $ (0.02

Diluted

  $ 0.07     $ 0.02     $ 0.19     $ (0.02
Summary of changes in estimated product warranty liabilities
                 
    Nine Months Ended September 30,  
    2012     2011  

Balance, January 1

  $ 427,459     $ 646,113  

Utilization of accrual

    (312,570     (456,823

Warranty expense

    265,140       249,652  
   

 

 

   

 

 

 

Balance, September 30

  $ 380,029     $ 438,942