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Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Financial Segment Information for Operating Segments

The segment information provided to the chief operating decision maker for the reportable segments is as follows:


		Year ended December 31, 2018
		Testing				Assembly				LCDD				Bumping				Others				Elimination				Total
		NT$000				NT$000				NT$000				NT$000				NT$000				NT$000				NT$000
Revenue
External customers			4,790,097				4,679,676				5,694,720				3,315,534				—				—				18,480,027
Inter-segment			—				—				—				—				35,738				(35,738	)			—

Total revenue			4,790,097				4,679,676				5,694,720				3,315,534				35,738				(35,738	)			18,480,027

Operating profit (loss)			1,306,742				(207,700	)			1,226,755				(202,497	)			(23,433	)			(146	)			2,099,721

Depreciation expenses			(769,660	)			(578,205	)			(1,400,784	)			(627,412	)			(518	)			—				(3,376,579	)

Share of profit (loss) of associates			—				—				—				—				(668,377	)			368,276				(300,101	)

Interest income			—				—				—				—				49,971				—				49,971

Interest expense			—				—				—				—				(152,416	)			—				(152,416	)

Purchase of property, plant and equipment			1,563,919				321,976				2,732,141				327,251				283				—				4,945,570


		Year ended December 31, 2019
		Testing				Assembly				LCDD				Bumping				Others				Elimination				Total
		NT$000				NT$000				NT$000				NT$000				NT$000				NT$000				NT$000
Revenue
External customers			4,257,800				5,148,877				6,922,205				4,008,999				—				—				20,337,881
Inter-segment			—				—				—				—				32,808				(32,808	)			—

Total revenue			4,257,800				5,148,877				6,922,205				4,008,999				32,808				(32,808	)			20,337,881

Operating profit (loss)			709,142				(227,096	)			1,740,720				232,404				1,931				18				2,457,119

Depreciation expenses			(802,740	)			(521,311	)			(1,796,951	)			(604,553	)			(6,359	)			—				(3,731,914	)

Share of profit (loss) of associates			—				—				—				—				(370,351	)			215,425				(154,926	)

Interest income			—				—				—				—				64,368				—				64,368

Interest expense			—				—				—				—				(171,075	)			—				(171,075	)

Purchase of property, plant and equipment			764,105				548,063				3,077,806				506,635				47				—				4,896,656


		Year ended December 31, 2020
		Testing				Assembly				LCDD				Bumping				Others				Elimination				Total
		NT$000				NT$000				NT$000				NT$000				NT$000				NT$000				NT$000
Revenue
External customers			5,002,730				6,001,964				7,023,003				4,983,684				—				—				23,011,381
Inter-segment			—				—				—				—				39,646				(39,646	)			—

Total revenue			5,002,730				6,001,964				7,023,003				4,983,684				39,646				(39,646	)			23,011,381

Operating profit (loss)			1,333,682				67,730				1,687,986				487,323				(10,230	)			11				3,566,502

Depreciation expenses			(853,829	)			(523,341	)			(2,213,504	)			(578,890	)			(5,955	)			—				(4,175,519	)

Share of profit (loss) of associates			—				—				—				—				(320,578	)			173,249				(147,329	)

Interest income			—				—				—				—				27,778				—				27,778

Interest expense			—				—				—				—				(162,400	)			—				(162,400	)

Purchase of property, plant and equipment			887,204				803,693				2,143,401				298,834				483				—				4,133,615

Schedule of information on products and services

e)

Information on products and services


		Year ended December 31,
		2018								2019								2020
		NT$000				%				NT$000				%				NT$000				%
Testing			4,790,097				26				4,257,800				21				5,002,730				22
Assembly			4,679,676				25				5,148,877				25				6,001,964				26
LCDD			5,694,720				31				6,922,205				34				7,023,003				30
Bumping			3,315,534				18				4,008,999				20				4,983,684				22

			18,480,027				100				20,337,881				100				23,011,381				100

Geographic Information of Revenue

f)

Geographical information


		Year ended December 31,
		2018				2019				2020
		NT$000				NT$000				NT$000
Revenue
ROC			14,751,766				15,875,027				18,341,726
Japan			1,825,479				1,905,032				1,291,026
Singapore			1,143,661				1,333,114				1,838,394
PRC			163,831				789,496				1,105,535
Others			595,290				435,212				434,700

			18,480,027				20,337,881				23,011,381


		December 31, 2019				December 31, 2020
		NT$000				NT$000
Non-current assets
ROC			18,727,979				18,913,501
PRC			—				117
Others			5,659				11,845

			18,733,638				18,925,463

Net Revenue from Customers Representing at Least 10% of Total Revenue

The information on the major customers which constituted more than 10% of the Group’s total revenue for the years ended December 31, 2018, 2019 and 2020 is as follows:


		Year ended December 31,
		2018								2019								2020
		Amount				%				Amount				%				Amount				%
		NT$000								NT$000								NT$000
Customers
Customer A			3,794,991				21				4,756,755				23				5,088,544				22
Customer X			1,328,752				7				1,977,427				10				2,660,866				12
Customer K			2,637,053				14				2,419,612				12				2,332,914				10
Customer C			1,957,467				11				2,048,260				10				2,143,130				9