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Organization and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2012
Organization and Summary of Significant Accounting Policies [Abstract]  
Summary of changes in estimated product warranty liabilities
                         
    2012     2011     2010  

Balance, beginning of period

  $ 427,459     $ 646,113     $ 369,311  

Utilization of accrual

    (470,301 )      (528,433 )      (566,466 ) 

Warranty expense

    526,563       309,779       843,268  
   

 

 

   

 

 

   

 

 

 

Balance, end of period

  $ 483,721     $ 427,459     $ 646,113  
   

 

 

   

 

 

   

 

 

 
Sales by geographic area
                         
    Year Ended December 31,  
    2012     2011     2010  

United States

    81 %      80 %      79 % 

Other Countries

    19       20       21  
   

 

 

   

 

 

   

 

 

 

Total

    100 %      100 %      100 % 
   

 

 

   

 

 

   

 

 

 
Assumptions used and the resulting estimates of weighted-average fair value per share of options granted
                 
    2011     2010  

Weighted average / range of volatility

    56 %      61 % 

Risk-free interest rate

    1.6       2.0  

Dividend rate

    —         —    

Expected life of options

    4.5 years       4.5 years  

Weighted average fair value of options granted

  $ 2.16     $ 2.59  
Weighted average number of shares outstanding and earnings per share
                         
    For the Year Ended December 31, 2011  
    2012     2011     2010  

Numerator for basic and diluted earnings per share:

                       

Net income (loss)

  $ 14,737,742     $ (7,039,866 )    $ (4,384,435 ) 
   

 

 

   

 

 

   

 

 

 

Denominator:

                       

Weighted average shares outstanding—basic

    53,827,204       59,435,624       62,524,446  

Dilutive effect of stock-based awards

    895,581       —          —     
   

 

 

   

 

 

   

 

 

 

Diluted weighted average shares outstanding

    54,722,785       59,435,624       62,524,446  
   

 

 

   

 

 

   

 

 

 

Anti-dilutive stock-based awards excluded (1)

    3,205,231       6,972,097       5,075,621  

Net income (loss) per common share:

                       

Basic

  $ 0.27     $ (0.12 )    $ (0.07 ) 

Diluted

    0.27       (0.12 )      (0.07 )