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PENSION BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract] |
Benefit Obligations, Fair Value of Plan Assets, and Funded Status | The following table sets forth the plan’s benefit obligations, fair value of plan assets, and funded status at December 31, 2019 and 2020:
|  | December 31 |
(in US$ thousands) |  | 2019 |  |  | 2020 |
Benefit Obligation |  | $ | 326 |  |  | $ | 385 |
Fair value of plan assets |  |  | 411 |  |  |  | 452 |
|  | $ | (85 | ) |  | $ | (67 | )
Amounts recognized in the balance sheet consist of: |  |  |  |  |  |  |  |
Noncurrent liabilities (assets) |  | $ | (85 | ) |  | $ | (67 | )
Accumulated other comprehensive income |  |  | — |  |  |  | — |
Net amount recognized |  | $ | (85 | ) |  | $ | (67 | )
Amounts recognized in accumulated comprehensive income (loss) consist of: |  |  |  |  |  |  |  |
Unrecognized net gain (loss) |  | $ | (66 | ) |  | $ | (94 | )
Pension Cost | For the years ended December 31, 2018, 2019 and 2020, the net period pension cost consisted of the following:
|  | December 31 |
(in US$ thousands) |  | 2018 |  |  | 2019 |  |  | 2020 |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 5 |  |  |  | 4 |  |  |  | 4 |
Expected return on plan assets |  |  | (6 | ) |  |  | (5 | ) |  |  | (5 | )
Amortization of net loss |  |  | 2 |  |  |  | 3 |  |  |  | 2 |
Curtailment gain |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Weighted Average Assumptions Used to Determine Benefit Obligations | Weighted average assumptions used to determine benefit obligations for 2019 and 2020 were as follows:
|  | December 31 |
|  | 2019 |  |  | 2020 |
Discount rate |  |  | 1.125 | % |  |  | 0.750 | %
Rate of compensation increase |  |  | 2.00 | % |  |  | 2.00 | %
Schedule of Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost | Weighted average assumptions used to determine net periodic benefit cost for end of fiscal year were as follows:
|  | 2019 |  |  | 2020 |
Discount rate |  |  | 1.375 | % |  |  | 1.125 | %
Rate of return on plan assets |  |  | 1.375 | % |  |  | 1.125 | %
Rate of compensation increase |  |  | 2.00 | % |  |  | 2.00 | %

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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