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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Current liabilities [abstract]  
Disclosure of detailed information about Other Current Liabilities [Text Block]
 
 
 
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
 
Disclosure of detailed information about allowance for sales returns and discounts [Text Block]
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