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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