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Other Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

		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

Schedule of Product Warranty Liability [Table Text Block]

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

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- References

No definition available.

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- Definition

Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses.

+ References

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- Definition

Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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