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Retirement Plan (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |  |
Description Of Maximum Retirement Benefit |  | The maximum retirement benefit is 45 months of salary |  |
Description Of Contribution To Pension Fund |  | The Company contributes an amount equal to 2% of wages and salaries paid every month to the Fund |  |
Defined Contribution Plan, Percentage Of Contribution, Description |  | the Company is required to make a monthly contribution for full-time employees in the ROC that elected to participate in the Defined Contribution Plan at a rate no less than 6% of the employee’s monthly wages to the employees’ individual pension fund accounts at the ROC Bureau of Labor Insurance |  |
Defined Contribution Plan, Cost Recognized |  | $ 2,455 | $ 2,304 | $ 2,091
Defined Benefit Plan, Accumulated Benefit Obligation |  | 1,211 | 1,033 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three |  | 94 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five |  | 35 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Six Fiscal Years Thereafter |  | 544 |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax |  | 1,906 | 1,128 | 1,409
Defined Benefit Plan, Expected Future Benefit Payments, Year Two |  | 30 |  |
Scenario, Forecast [Member] |  |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Amortization of Net Gains (Losses) | $ 97 |  |  |
Scenario, Forecast [Member] | Bank of taiwan [Member] |  |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |  |
Pension Contributions | 115 |  |  |
Employee Social Security Plan [Member] |  |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |  |
Defined Contribution Plan, Cost Recognized |  | $ 1,445 | $ 1,012 | $ 778
ROC Bureau Of Labor Insurance [Member] | Scenario, Forecast [Member] |  |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |  |
Pension Contributions | $ 2,828 |  |  |

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the six fiscal years after the sixth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Describes the contribution percentage to individual employee pension plan. + References No definition available. + Details
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- Definition Describes the maximum retirement benefit. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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