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Property and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment | 9. PROPERTY AND EQUIPMENT
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |
Cost: |  |  |  |  |  |  |  |
Land |  |  | 68,243 |  |  |  | 68,243 |
Buildings |  |  | 18,130 |  |  |  | 18,130 |
Machinery and equipment |  |  | 26,426 |  |  |  | 35,555 |
Furniture and fixtures |  |  | 6,919 |  |  |  | 7,855 |
Leasehold and buildings improvement |  |  | 7,964 |  |  |  | 8,023 |
Software |  |  | 25,938 |  |  |  | 33,528 |
Total |  |  | 153,620 |  |  |  | 171,334 |
Accumulated depreciation: |  |  |  |  |  |  |  |
Buildings |  |  | 3,632 |  |  |  | 4,033 |
Machinery and equipment |  |  | 18,828 |  |  |  | 22,922 |
Furniture and fixtures |  |  | 5,196 |  |  |  | 5,862 |
Leasehold and buildings improvement |  |  | 5,350 |  |  |  | 6,221 |
Software |  |  | 22,312 |  |  |  | 27,293 |
|  |  | 55,318 |  |  |  | 66,331 |
Prepayment and construction in progress |  |  | 186 |  |  |  | 493 |
|  |  | 98,488 |  |  |  | 105,496 |
In April 2006, the Company leased a property located in Taipei, Taiwan to a third party. The lessee has been renewing annually and last renewed in March 2021. Net carrying value of the properties as of December 31, 2019 and 2020 was US$673 thousand and US$654 thousand, respectively. Annual rental income from the lease is US$45 thousand. In September 2018, the Company paid US$58,931 thousand to acquire land in Hsinchu, Taiwan for the purpose of constructing its future Taiwan headquarters building.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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