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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2015
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 |
|  | 2013 |  |  | 2014 |  |  | 2015 |
|  | US$ |  |  | US$ |  |  | US$ |
Taiwan |  |  | 24,066 |  |  |  | 28,739 |  |  |  | 32,014 |
United States |  |  | 54 |  |  |  | 142 |  |  |  | 274 |
Korea |  |  | 1,773 |  |  |  | 2,477 |  |  |  | 1,891 |
China |  |  | 4,266 |  |  |  | 4,163 |  |  |  | 16,268 |
Japan |  |  | 36 |  |  |  | 16 |  |  |  | 22 |
|  |  | 30,195 |  |  |  | 35,537 |  |  |  | 50,469 |
Customer Lists |
Net Sales | Major customers representing at least 10% of net sales
|  | Year Ended December 31 |
|  | 2013 |  |  | 2014 |  |  | 2015 |
|  | US$ |  |  | % |  |  | US$ |  |  | % |  |  | US$ |  |  | % |
SK Hynix |  |  | 67,977 |  |  |  | 30 |  |  |  | 107,227 |  |  |  | 37 |  |  |  | 108,645 |  |  |  | 30 |
Samsung |  |  | 36,037 |  |  |  | 16 |  |  |  | 30,065 |  |  |  | 10 |  |  |  | * |  |  |  | * |
* | Less than 10%
Product |
Net Sales | The following summarizes the Company’s revenue by product category:
|  | Year Ended December 31 |
|  | 2013 |  |  | 2014 |  |  | 2015 |
|  | US$ |  |  | US$ |  |  | US$ |
Mobile Storage |  |  | 185,488 |  |  |  | 241,614 |  |  |  | 302,910 |
Mobile Communications |  |  | 31,022 |  |  |  | 40,034 |  |  |  | 50,896 |
Others |  |  | 8,798 |  |  |  | 7,675 |  |  |  | 7,491 |
|  |  | 225,308 |  |  |  | 289,323 |  |  |  | 361,297 |
Country |
Net Sales | The following summarizes the Company’s revenue by geographic area:
|  | Year Ended December 31 |
|  | 2013 |  |  | 2014 |  |  | 2015 |
|  | US$ |  |  | US$ |  |  | US$ |
Taiwan |  |  | 47,653 |  |  |  | 57,244 |  |  |  | 71,387 |
United States |  |  | 22,528 |  |  |  | 26,265 |  |  |  | 39,558 |
Japan |  |  | 3,936 |  |  |  | 11,180 |  |  |  | 19,636 |
Korea |  |  | 115,287 |  |  |  | 150,557 |  |  |  | 150,118 |
China |  |  | 29,129 |  |  |  | 35,008 |  |  |  | 69,623 |
Others |  |  | 6,775 |  |  |  | 9,069 |  |  |  | 10,975 |
|  |  | 225,308 |  |  |  | 289,323 |  |  |  | 361,297 |

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