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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Revenue by Product Category | 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 by Geographic Area | 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 |
Major customers representing at least 10% of net sales | 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 | 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 Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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