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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Components of Accumulated Other Comprehensive Income (Loss) | The following table presents the components of accumulated other comprehensive income (loss) as of December 31, 2014, 2015 and 2016:
|  | Year Ended December 31, 2014 |  |  | Year Ended December 31, 2015 |  |  | Year Ended December 31, 2016 |
|  | 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 |  |  | 4,556 |  |  |  | (461 | ) |  |  | 4,095 |  |  |  | 3,354 |  |  |  | (849 | ) |  |  | 2,505 |  |  |  | 1,486 |  |  |  | (853 | ) |  |  | 633 |
Current-period change |  |  | (1,202 | ) |  |  | (388 | ) |  |  | (1,590 | ) |  |  | (1,868 | ) |  |  | (4 | ) |  |  | (1,872 | ) |  |  | (1,555 | ) |  |  | (110 | ) |  |  | (1,665 | )
Ending balance |  |  | 3,354 |  |  |  | (849 | ) |  |  | 2,505 |  |  |  | 1,486 |  |  |  | (853 | ) |  |  | 633 |  |  |  | (69 | ) |  |  | (963 | ) |  |  | (1,032 | )
Revised Previously Reported Consolidated Statements of Cash Flows | The following table reflects the adjustments made to the consolidated statements of cash flows to confirm prior period classifications under the new guidance for the periods presented:
|  | As Reported |  |  | Adjustment |  |  | As Adjusted |
|  | US$ |  |  | US$ |  |  | US$ |
Year Ended December 31, 2013: |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  | 49,128 |  |  |  | — |  |  |  | 49,128 |
Net cash used in investing activities |  |  | (12,815 | ) |  |  | 89 |  |  |  | (12,726 | )
Net cash used in financing activities |  |  | (29,493 | ) |  |  | — |  |  |  | (29,493 | )
Net increase (decrease) in cash, cash equivalents, and restricted cash* |  |  | 6,820 |  |  |  | 89 |  |  |  | 6,909 |
Effect of exchange rate changes |  |  | 166 |  |  |  | — |  |  |  | 166 |
Cash, cash equivalents, and restricted cash* at beginning of year |  |  | 154,734 |  |  |  | 17,775 |  |  |  | 172,509 |
Cash, cash equivalents, and restricted cash* at end of year |  |  | 161,720 |  |  |  | 17,864 |  |  |  | 179,584 |
Year Ended December 31, 2014: |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  | 68,725 |  |  |  | — |  |  |  | 68,725 |
Net cash used in investing activities |  |  | (15,413 | ) |  |  | 3,817 |  |  |  | (11,596 | )
Net cash used in financing activities |  |  | (19,710 | ) |  |  | — |  |  |  | (19,710 | )
Net increase (decrease) in cash, cash equivalents, and restricted cash* |  |  | 33,602 |  |  |  | 3,817 |  |  |  | 37,419 |
Effect of exchange rate changes |  |  | (1,111 | ) |  |  | — |  |  |  | (1,111 | )
Cash, cash equivalents, and restricted cash* at beginning of year |  |  | 161,720 |  |  |  | 17,864 |  |  |  | 179,584 |
Cash, cash equivalents, and restricted cash* at end of year |  |  | 194,211 |  |  |  | 21,681 |  |  |  | 215,892 |
Year Ended December 31, 2015: |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  | 65,946 |  |  |  | — |  |  |  | 65,946 |
Net cash used in investing activities |  |  | (58,414 | ) |  |  | (44 | ) |  |  | (58,458 | )
Net cash used in financing activities |  |  | (20,271 | ) |  |  | — |  |  |  | (20,271 | )
Net increase (decrease) in cash, cash equivalents, and restricted cash* |  |  | (12,739 | ) |  |  | (44 | ) |  |  | (12,783 | )
Effect of exchange rate changes |  |  | (953 | ) |  |  | — |  |  |  | (953 | )
Cash, cash equivalents, and restricted cash* at beginning of year |  |  | 194,211 |  |  |  | 21,681 |  |  |  | 215,892 |
Cash, cash equivalents, and restricted cash* at end of year |  |  | 180,519 |  |  |  | 21,637 |  |  |  | 202,156 |
* | The restricted cash is only included in the amount of “as adjusted” item.
Reconciliation of Cash Cash Equivalents and Restricted cash | To early adopt the accounting update, the Company has amended the presentation of changes in cash and cash equivalents by explaining the changes in the total of cash, cash equivalents, and restricted cash. The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statement of cash flows.
|  | As of December 31 |
|  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |  |  | US$ |  |  | US$ |
Cash and cash equivalents |  |  | 161,720 |  |  |  | 194,211 |  |  |  | 180,519 |  |  |  | 274,483 |
Restricted cash included in restricted assets-current |  |  | 15,299 |  |  |  | 19,322 |  |  |  | 19,328 |  |  |  | 44,393 |
Restricted cash included in other assets |  |  | 2,565 |  |  |  | 2,359 |  |  |  | 2,309 |  |  |  | 2,301 |
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows |  |  | 179,584 |  |  |  | 215,892 |  |  |  | 202,156 |  |  |  | 321,177 |

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