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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | The following table presents the components of accumulated other comprehensive income (loss) as of December 31, 2018, 2019 and 2020:
|  | Year Ended December 31, 2018 |  |  | Year Ended December 31, 2019 |  |  | Year Ended December 31, 2020 |
|  | US$ |  |  | US$ |  |  | US$ |
|  | Foreign currency items |  |  | Defined benefit pension plans |  |  | Accumulated other comprehensive income (loss) |  |  | Foreign currency items |  |  | Defined benefit pension plans |  |  | Accumulated other comprehensive income (loss) |  |  | Foreign currency items |  |  | Defined benefit pension plans |  |  | Accumulated other comprehensive income (loss) |
Beginning balance |  |  | 3,321 |  |  |  | (678 | ) |  |  | 2,643 |  |  |  | 1,173 |  |  |  | (678 | ) |  |  | 495 |  |  |  | (92 | ) |  |  | (693 | ) |  |  | (785 | )
Current-period change |  |  | (2,148 | ) |  |  | — |  |  |  | (2,148 | ) |  |  | (1,265 | ) |  |  | (15 | ) |  |  | (1,280 | ) |  |  | 497 |  |  |  | (61 | ) |  |  | 436 |
Ending balance |  |  | 1,173 |  |  |  | (678 | ) |  |  | 495 |  |  |  | (92 | ) |  |  | (693 | ) |  |  | (785 | ) |  |  | 405 |  |  |  | (754 | ) |  |  | (349 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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