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Right-of-use asset and lease liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Right-of-use asset and lease liabilities |
Schedule of lease cost, balance sheet and cash flow information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | (in thousands) | ​ | ​ | ​
Operating lease cost | ​ | $ | 5,932 | ​ | $ | 5,306 | ​ | $ | 5,052
Variable lease cost | ​ | ​ | 785 | ​ | ​ | 698 | ​ | ​ | 607
Sublease income | ​ | ​ | (849) | ​ | ​ | (907) | ​ | ​ | (904)
Total lease cost | ​ | $ | 5,868 | ​ | $ | 5,097 | ​ | $ | 4,755
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Assets | ​ | ​ | ​ | ​ | ​ | ​
Operating lease right-of-use assets | ​ | $ | 32,726 | ​ | ​ | 25,573
Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Current | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | ​ | 8,382 | ​ | ​ | 5,774
Non-current | ​ | ​ | ​ | ​ | ​ | ​
Non-current operating lease liabilities | ​ | ​ | 31,719 | ​ | ​ | 28,987
Total lease liabilities | ​ | $ | 40,101 | ​ | ​ | 34,761
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | (in thousands)
Cash paid for amounts included in the measurement of lease liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating cash flows for operating leases | ​ | $ | 7,532 | ​ | $ | 5,738 | ​ | $ | 5,769
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use asset obtained in exchange for lease obligation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease | ​ | $ | 9,824 | ​ | $ | 1,699 | ​ | $ | —
​
Schedule of undiscounted cash flows and minimum lease payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Lexington | ​ | Amsterdam(1) | ​ | Other | ​ | Total
​ | (in thousands)
2023 | $ | 5,236 | ​ | $ | 3,042 | ​ | $ | 104 | ​ | $ | 8,382
2024 | ​ | 5,504 | ​ | ​ | 1,993 | ​ | ​ | 104 | ​ | ​ | 7,601
2025 | ​ | 5,859 | ​ | ​ | 1,993 | ​ | ​ | 104 | ​ | ​ | 7,956
2026 | ​ | 6,031 | ​ | ​ | 1,993 | ​ | ​ | 104 | ​ | ​ | 8,128
2027 | ​ | 6,207 | ​ | ​ | 1,997 | ​ | ​ | 104 | ​ | ​ | 8,308
Thereafter | ​ | 9,343 | ​ | ​ | 7,190 | ​ | ​ | 469 | ​ | ​ | 17,002
Total lease payments | $ | 38,180 | ​ | $ | 18,208 | ​ | $ | 989 | ​ | $ | 57,377
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: amount of lease payments representing interest payments | ​ | (10,611) | ​ | ​ | (6,268) | ​ | ​ | (397) | ​ | ​ | (17,276)
Present value of lease payments | ​ | 27,569 | ​ | ​ | 11,940 | ​ | ​ | 592 | ​ | ​ | 40,101
Less: current operating lease liabilities | ​ | (5,236) | ​ | ​ | (3,042) | ​ | ​ | (104) | ​ | ​ | (8,382)
Non-current operating lease liabilities | $ | 22,333 | ​ | $ | 8,898 | ​ | $ | 488 | ​ | $ | 31,719
| (1) | Payments are due in EUR and have been translated at the foreign exchange rate as of December 31, 2022, of $1.07 / €1.00)

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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