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Other Current Liabilities
 12 Months Ended
Dec. 31, 2018
Current liabilities [abstract]  
Disclosure of other current liabilities [text block]
Note 16.
Other Current Liabilities
 
  
January 1,
  
December 31,
  
December 31,
 
  
2017
  
2017
  
2018
 
  
(in thousands)
 
          
Accrued payroll and related expenses $6,958   9,461   10,009 
Accrued mask, mold fees and other expenses for RD  7,503   8,816   9,935 
Payable for purchases of building and equipment  1,615   10,726   5,611 
Accrued software maintenance  891   1,004   1,921 
Allowance for sales discounts  1,536   1,203   494 
Accrued insurance, welfare expenses, professional fee  12,754   11,261   13,810 
  
$
31,257
   
42,471
   
41,780
 
 
The activity in the sales discounts is as follows:
 
Allowance for sales discounts
 
Period
 
Balance at

beginning

of year
  
Charges to
 

earnings
  
Amounts
 

utilized
  
Balance at

end of

year
 
  
(in thousands)
 
             
Year 2017 $1,536   8,720   (9,053)  1,203 
Year 2018 $1,203   1,855   (2,564)  494