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Other Accrued Expenses and Other Current Liabilities
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Note 11.
Other Accrued Expenses and Other Current Liabilities
 
 
 
December 31,
 
 
 
2016
 
2017
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
Accrued mask, mold fees and other expenses for RD
 
$
7,503
 
 
8,816
 
Payable for purchases of building and equipment
 
 
1,615
 
 
10,726
 
Accrued software maintenance
 
 
891
 
 
1,004
 
Accrued payroll and related expenses
 
 
6,958
 
 
9,461
 
Accrued professional service fee
 
 
923
 
 
1,050
 
Sales received in advance
 
 
1,193
 
 
603
 
Accrued warranty costs
 
 
48
 
 
40
 
Accrued insurance, welfare expenses, etc.
 
 
10,590
 
 
9,568
 
 
 
$
29,721
 
 
41,268
 
 
The movement in accrued warranty costs for the years ended December 31, 2015, 2016 and 2017 is as follows:
 
Period
 
Balance at 
beginning 
of year
 
Additions
charged to
expense
 
Amounts
utilized
 
Balance at
end
of year
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year 2015
 
$
103
 
 
1,121
 
 
(997)
 
 
227
 
Year 2016
 
$
227
 
 
11
 
 
(190)
 
 
48
 
Year 2017
 
$
48
 
 
146
 
 
(154)
 
 
40