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Segment Information | 12 Months Ended
--- | ---
Dec. 31, 2020
Segment Reporting [Abstract] |
Segment Information | 20. SEGMENT INFORMATION The Company is the global leader and pioneer in developing NAND flash controllers for solid storage devices. The Company currently operates as one reportable segment. The chief operating decision maker (“CODM”) is the Chief Executive Officer. The fact that the Company operates in only one reportable segment is because the decisions on allocation of resources and other operational decisions are made by the CODM based on his direct involvement with the Company’s operations and product development. The Company groups its products into three categories, based on the markets in which they may be used. The following summarizes the Company’s revenue by product category:
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |  |  | US$ |
Mobile Storage |  |  | 494,012 |  |  |  | 441,700 |  |  |  | 532,682 |
Mobile Communications |  |  | 30,163 |  |  |  | 10,356 |  |  |  | — |
Others |  |  | 6,173 |  |  |  | 5,197 |  |  |  | 6,839 |
|  |  | 530,348 |  |  |  | 457,253 |  |  |  | 539,521 |
Revenue is attributed to a geographic area based on the bill-to location. The following summarizes the Company’s revenue by geographic area:
|  | Year Ended December 31 |
|  | 2018 (1) |  |  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |  |  | US$ |
Taiwan |  |  | 70,984 |  |  |  | 77,117 |  |  |  | 95,023 |
United States |  |  | 53,476 |  |  |  | 63,432 |  |  |  | 42,099 |
Korea |  |  | 135,845 |  |  |  | 52,885 |  |  |  | 24,261 |
China |  |  | 142,948 |  |  |  | 123,261 |  |  |  | 154,789 |
Malaysia |  |  | 49,444 |  |  |  | 50,663 |  |  |  | 46,319 |
Singapore |  |  | 35,387 |  |  |  | 45,032 |  |  |  | 97,813 |
Others |  |  | 42,264 |  |  |  | 44,863 |  |  |  | 79,217 |
|  |  | 530,348 |  |  |  | 457,253 |  |  |  | 539,521 |
(1) | In 2019 and 2020, revenue billed to Japan was reclassified to others.
Major customers representing at least 10% of net sales
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | US$ |  |  | % |  |  | US$ |  |  | % |  |  | US$ |  |  | % |
Intel |  |  | 67,791 |  |  |  | 13 |  |  |  | 75,608 |  |  |  | 16 |  |  |  | * |  |  |  | * |
Micron |  |  | * |  |  |  | * |  |  |  | 67,682 |  |  |  | 15 |  |  |  | 127,708 |  |  |  | 24 |
SK Hynix |  |  | 111,265 |  |  |  | 21 |  |  |  | * |  |  |  | * |  |  |  | * |  |  |  | * |
* | Less than 10%
Long-lived assets (property and equipment, net) by geographic area were as follows:
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |  |  | US$ |
Taiwan |  |  | 96,920 |  |  |  | 94,996 |  |  |  | 102,420 |
United States |  |  | 348 |  |  |  | 315 |  |  |  | 254 |
Korea |  |  | 1,645 |  |  |  | 23 |  |  |  | 11 |
China |  |  | 2,447 |  |  |  | 3,117 |  |  |  | 2,770 |
Japan |  |  | 50 |  |  |  | 37 |  |  |  | 41 |
|  |  | 101,410 |  |  |  | 98,488 |  |  |  | 105,496 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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