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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Components of Inventory | The components of inventories are as follows:
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |
Finished goods |  |  | 26,305 |  |  |  | 11,039 |
Work in process |  |  | 37,342 |  |  |  | 55,988 |
Raw materials |  |  | 24,792 |  |  |  | 43,135 |
|  |  | 88,439 |  |  |  | 110,162 |

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