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Other Accrued Expenses and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2012
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
  December 31, 
  2011  2012 
  (in thousands) 
       
Accrued mask, mold fees and other expenses for RD $8,211   7,582 
Payable for purchases of equipment  2,276   1,694 
Accrued software maintenance  1,830   2,006 
Accrued payroll and related expenses  3,837   4,144 
Accrued professional service fee  1,210   1,025 
Accrued warranty costs  78   197 
Accrued insurance, welfare expenses, etc.  5,721   7,077 
  $23,163   23,725 
Schedule of Product Warranty Liability [Table Text Block]

The movement in accrued warranty costs for the years ended December 31, 2010, 2011 and 2012 is as follows:

 

Period  

Balance at

beginning

of year

    

Additions
(reversal)

charged to

expense

    

 

Amounts
utilized

    

Balance at

end of
year

  
    (in thousands)  
                         
Year ended December 31, 2010   $ 679       3,772       (3,772 )     679  
Year ended December 31, 2011   $ 679       (321 )     (280 )     78  
Year ended December 31, 2012   $ 78       856       (737 )     197