The carrying amounts of each class of other intangible assets were as follows:

	December 31
	2017		2018
	NT$		NT$		US$ (Note 4)

Customer relationships	$	113,776	$	10,366,797	$	338,673
Computer software		864,331		1,159,682		37,886
Patents and acquired specific technology		319,402		19,255,669		629,065
Others		109,356		115,552		3,775

	$	1,406,865	$	30,897,700	$	1,009,399

For the year ended December 31, 2016

	Customer relationships			Computer software			Patents and acquired specific technology			Others			Total
	NT$			NT$			NT$			NT$			NT$

Cost

Balance at January 1, 2016	$	915,636		$	3,338,360		$	154,082		$	193,338		$	4,601,416
Additions (Note 37)		-			372,188			301,351			1,605			675,144
Disposals or derecognization		(41,099	)		(80,537	)		(1,310	)		-			(122,946	)
Reclassification		-			-			786			-			786
Acquisitions through business combinations		41,099			-			64,380			30			105,509
Effect of foreign currency exchange differences		-			(77,782	)		(4,846	)		(2,581	)		(85,209	)

Balance at December 31, 2016	$	915,636		$	3,552,229		$	514,443		$	192,392		$	5,174,700

Accumulated amortization

Balance at January 1, 2016	$	641,234		$	2,385,038		$	138,386		$	54,665		$	3,219,323
Amortization expense		121,412			345,836			24,154			17,421			508,823
Disposals or derecognization		(41,099	)		(58,765	)		(1,310	)		-			(101,174	)
Reclassification		-			-			786			-			786
Acquisitions through business combinations		-			-			483			23			506
Effect of foreign currency exchange differences		-			(63,407	)		(7,283	)		(135	)		(70,825	)

Balance at December 31, 2016	$	721,547		$	2,608,702		$	155,216		$	71,974		$	3,557,439

For the year ended December 31, 2017

	Customer relationships		Computer software			Patents and acquired specific technology			Others			Total
	NT$		NT$			NT$			NT$			NT$
Cost

Balance at January 1, 2017	$	915,636	$	3,552,229		$	514,443		$	192,392		$	5,174,700
Additions		-		265,497			-			12,328			277,825
Disposals		-		(83,595	)		(123,744	)		(4,978	)		(212,317	)
Effect of foreign currency exchange differences		-		(47,679	)		(1,213	)		(988	)		(49,880	)

Balance at December 31, 2017	$	915,636	$	3,686,452		$	389,486		$	198,754		$	5,190,328

Accumulated amortization

Balance at January 1, 2017	$	721,547	$	2,608,702		$	155,216		$	71,974		$	3,557,439
Amortization expense		80,313		316,580			43,493			17,280			457,666
Disposals		-		(72,481	)		(123,743	)		-			(196,224	)
Effect of foreign currency exchange differences		-		(30,680	)		(4,882	)		144			(35,418	)

Balance at December 31, 2017	$	801,860	$	2,822,121		$	70,084		$	89,398		$	3,783,463

For the year ended December 31, 2018

	Customer relationships		Computer software			Patents and acquired specific technology			Others			Total
	NT$		NT$			NT$			NT$			NT$

Cost

Balance at January 1, 2018	$	915,636	$	3,686,452		$	389,486		$	198,754		$	5,190,328
Additions		-		528,883			-			8,776			537,659
Disposals		-		(95,358	)		(231	)		(4,000	)		(99,589	)
Acquisition through business combinations (Note 30)		11,000,000		274,868			20,200,000			32,800			31,507,668
Effect of foreign currency exchange differences		-		6,200			(899	)		(332	)		4,969

Balance at December 31, 2018	$	11,915,636	$	4,401,045		$	20,588,356		$	235,998		$	37,141,035

	Customer relationships		Computer software			Patents and acquired specific technology			Others			Total
	NT$		NT$			NT$			NT$			NT$

Accumulated amortization

Balance at January 1, 2018	$	801,860	$	2,822,121		$	70,084		$	89,398		$	3,783,463
Amortization expense		746,979		373,536			1,263,309			18,626			2,402,450
Disposals		-		(95,202	)		(231	)		(4,000	)		(99,433	)
Acquisition through business combinations (Note 30)		-		137,799			-			15,483			153,282
Effect of foreign currency exchange differences		-		3,109			(475	)		939			3,573

Balance at December 31, 2018	$	1,548,839	$	3,241,363		$	1,332,687		$	120,446		$	6,243,335

	Customer relationships		Computer software			Patents and acquired specific technology			Others			Total
	US$ (Note 4)		US$ (Note 4)			US$ (Note 4)			US$ (Note 4)			US$ (Note 4)
Cost

Balance at January 1, 2018	$	29,913	$	120,433		$	12,724		$	6,493		$	169,563
Additions		-		17,278			-			287			17,565
Disposals		-		(3,115	)		(8	)		(131	)		(3,254	)
Acquisition through business combinations		359,359		8,980			659,915			1,072			1,029,326
Effect of foreign currency exchange differences		-		202			(29	)		(11	)		162

Balance at December 31, 2018	$	389,272	$	143,778		$	672,602		$	7,710		$	1,213,362

Accumulated amortization

Balance at January 1, 2018	$	26,196	$	92,196		$	2,290		$	2,921		$	123,603
Amortization expense		24,403		12,203			41,271			608			78,485
Disposals		-		(3,110	)		(8	)		(131	)		(3,249	)
Acquisition through business combinations		-		4,502			-			506			5,008
Effect of foreign currency exchange differences		-		101			(16	)		31			116

Balance at December 31, 2018	$	50,599	$	105,892		$	43,537		$	3,935		$	203,963