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Warranty Reserves (Tables)
 3 Months Ended
Mar. 31, 2013
Changes in Accrued Warranty Expense

The following table shows the changes in accrued warranty expense for the three months ended March 31, 2012 and 2013:

 

 

For the three months ended

 

March 31,  

 

 

 

2012  

2013  

 

 

 

 

(Unaudited)

(Unaudited)

Beginning balance             

$              135,708             

$              115,566             

Additions             

              27,763             

              19,572             

Usage             

              (21,075              )

              (27,549              )

 

 

 

Ending balance             

$              142,396             

$              107,589