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Segment, Product and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of operating segments [abstract]

Disclosure of detailed information about segment reporting [Text Block]

The Non-driver segment primarily is engaged in the design, research, manufacturing and sale of non-driver products, such as timing controllers, 3D Sensing Solution, LCOS, CMOS Image Sensors and WLO.

	Year Ended December 31, 2017
	Driver IC		Non-driver products			Consolidated Total
	(in thousands)

Segment revenues	$	529,847		155,320			685,167
Segment operating income (loss)	$	43,021		(34,662	)		8,359
Non operating income, net							21,733
Consolidated profits before income taxes						$	30,092

		Year Ended December 31, 2017
		Driver IC	Non-driver products	Consolidated Total
			(in thousands)

Significant noncash items:
Share Based Compensation	$	365	632	997
Depreciation and amortization	$	4,940	11,740	16,680

	Year Ended December 31, 2018
	Driver IC		Non-driver products			Consolidated Total
	(in thousands)

Segment revenues	$	586,258		137,347			723,605
Segment operating income (loss)	$	56,023		(52,638	)		3,385
Non operating income, net							3,635
Consolidated profits before income taxes						$	7,020
Significant noncash items:
Share Based Compensation	$	189		219			408
Depreciation and amortization	$	3,248		17,079			20,327

Disclosure of detailed information about segment revenues in geographic region [Text Block]

The following tables summarize information pertaining to the segment revenues from customers in different geographic region (based on customer’s headquarter location):

	For the year ended December 31, 2017
	Driver IC		Non-driver products		Consolidated Total
	(in thousands)

China	$	353,505		67,703		421,208
Taiwan		146,302		30,649		176,951
Other Asia Pacific (Philippines, Korea and Japan)		30,040		37,739		67,779
Europe and America		-		19,229		19,229
	$	529,847		155,320		685,167

	For the year ended December 31, 2018
	Driver IC		Non-driver products		Consolidated Total
	(in thousands)

China	$	419,249		61,143		480,392
Taiwan		136,526		31,596		168,122
Other Asia Pacific (Philippines, Korea and Japan)		30,483		41,811		72,294
Europe and America		-		2,797		2,797
	$	586,258		137,347		723,605

Disclosure of detailed information about segment revenues in major product lines [Text Block]

The following tables summarize information pertaining to the segment revenues from major product lines:

	For the year ended December 31, 2017
	Driver IC		Non-driver products		Consolidated Total
	(in thousands)

Display drivers for large-size applications	$	224,798		-		224,798
Display drivers for mobile handsets applications		113,591		-		113,591
Display drivers for consumer electronics applications		191,458		-		191,458
Non-driver products		-		155,320		155,320
	$	529,847		155,320		685,167

	For the year ended December 31, 2018
	Driver IC		Non-driver products		Consolidated Total
	(in thousands)
Display drivers for large-size applications	$	260,540		-		260,540
Display drivers for mobile handsets applications		112,221		-		112,221
Display drivers for consumer electronics applications		213,497		-		213,497
Non-driver products		-		137,347		137,347
	$	586,258		137,347		723,605

Disclosure Of Detailed Information About Tangible Long lived Assets Explanatory [Text Block]

The carrying values of the Company’s tangible long-lived assets are located in the following countries:

	January 1, 2017		December 31, 2017		December 31, 2018
	(in thousands)
Taiwan	$	46,445		83,730		109,732
U.S.		45		25		668
China		751		651		540
Korea		47		150		83
Israel		-		-		28
Japan		21		19		16
	$	47,309		84,575		111,067

Disclosure Of Detailed Information About segmenting revenues by customers [Text Block]

Revenues from significant customers, those representing 10% or more of total revenue for the respective periods, are summarized as follows:

	Year ended December 31,
	2017		2018
	(in thousands)
Driver IC segment:
Customer A and its affiliates	$	147,961		178,907
Customer B and its affiliates		102,493		87,927
	$	250,454		266,834
Non-driver products segment:
Customer A and its affiliates	$	28,767		24,088
Customer B and its affiliates		3,887		2,917
	$	32,654		27,005

Disclosure Of Detailed Information About trade receivables [Text Block]

Accounts receivable from significant customers, those representing 10% or more of total accounts receivable for the respective dates, is summarized as follows:

	January 1, 2017		December 31, 2017		December 31, 2018
	(in thousands)
Customer A and its affiliates	$	55,681		61,100		63,501
Customer B and its affiliates		36,849		29,008		24,462
	$	92,530		90,108		87,963