Inventories

12 Months Ended

Dec. 31, 2020

10.	Inventories

December 31, 2019

Cost

Allowance for
impairment losses

Carrying amount

NT$000

Raw materials

1,831,140

(63,498

)

1,767,642

December 31, 2020

Cost

Allowance for
impairment losses

Carrying amount

NT$000

Raw materials

2,181,890

(79,815

)

2,102,075

The cost of inventories recognized as an expense for the year:


	Year ended December 31,
	2018			2019		2020
	NT$000			NT$000		NT$000
Cost of revenue		15,057,605			16,372,032		17,957,568
Loss on abandonment		5,497			12,369		5,323
Allowance for (reversal of ) inventory valuation and obsolescence loss		(13,070	)		27,341		16,317

		15,050,032			16,411,742		17,979,208

Reversal of allowance for inventory valuation and obsolescence loss was recognized due to the change in net realizable market value.

No inventories of the Group were pledged to others.