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Employee Benefit Plan (Tables) - Non-U.S. Plan | 12 Months Ended
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Dec. 31, 2020
Employee Benefit Plan |
Schedule of net periodic pension cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost (gross) | ​ | $ | 1,549 | ​ | $ | 1,164 | ​ | $ | 1,281
Interest cost | ​ | ​ | 106 | ​ | ​ | 234 | ​ | ​ | 199
Expected return on plan assets | ​ | ​ | (271) | ​ | ​ | (242) | ​ | ​ | (327)
Amortization of unrecognized actuarial gain | ​ | ​ | (40) | ​ | ​ | (22) | ​ | ​ | 18
Net periodic pension cost | ​ | $ | 1,344 | ​ | $ | 1,134 | ​ | $ | 1,171
Summary of net unfunded status of pension plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2020 |  | 2019
Fair value of plan assets | ​ | $ | 17,290 | ​ | $ | 14,159
Projected benefit obligation | ​ | ​ | (27,431) | ​ | ​ | (21,759)
Net unfunded benefit obligation | ​ | $ | (10,141) | ​ | $ | (7,600)
Schedule of change in the fair value of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at January 1 | ​ | $ | 14,159 | ​ | $ | 12,823
Employee contributions | ​ | ​ | 512 | ​ | ​ | 485
Actual return on plan assets | ​ | ​ | 441 | ​ | ​ | 908
Benefits (paid), net of transfers | ​ | ​ | (251) | ​ | ​ | (977)
Employer contributions | ​ | ​ | 1,088 | ​ | ​ | 977
Foreign exchange adjustment | ​ | ​ | 1,341 | ​ | ​ | (57)
Fair value of plan assets at December 31 | ​ | $ | 17,290 | ​ | $ | 14,159
Schedule of change in benefit obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligations at January 1 | ​ | $ | 21,759 | ​ | $ | 18,173
Gross service cost | ​ | ​ | 1,549 | ​ | ​ | 1,164
Interest cost | ​ | ​ | 106 | ​ | ​ | 234
Employee contributions | ​ | ​ | 512 | ​ | ​ | 485
Actuarial (gains)/losses | ​ | ​ | 1,694 | ​ | ​ | 2,763
Benefits (paid), net of transfers | ​ | ​ | (251) | ​ | ​ | (977)
Foreign exchange adjustment | ​ | ​ | 2,062 | ​ | ​ | (83)
Benefit obligations at December 31 | ​ | $ | 27,431 | ​ | $ | 21,759
Summary of weighted average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2020 |  | 2019
​ | ​ | (%)
Discount rates | ​ | 0.05 | - | 0.60 | ​ | 0.15 | - | 0.70
Inflation | ​ | 0.90 | - | 1.80 | ​ | 1.00 | - | 2.00
Expected return on plan assets | ​ | 1.25 | - | 2.00 | ​ | 1.25 | - | 2.00
Rate of salary increases | ​ | 1.90 | - | 2.80 | ​ | 2.00 | - | 2.80
Schedule of projected future pension benefits | ​
​ | ​ | ​ | ​
2021 |  | $ | 611
2022 | ​ |  | 860
2023 | ​ |  | 750
2024 | ​ |  | 631
2025 | ​ |  | 769
Beyond | ​ |  | 5,135

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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://fasb.org/us-gaap/role/ref/legacyRef -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 the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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