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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases |
Schedule of operating lease liabilities maturities | The following table reconciles the undiscounted cash flows for the operating leases at December 31, 2021 to the operating lease liabilities recorded on the balance sheet (in thousands):
​ | ​ | ​ | ​
Years ending December 31, | ​ | ​
2022 | ​ | $ | 2,097
2023 | ​ | ​ | 5,566
2024 | ​ | ​ | 5,713
2025 | ​ | ​ | 5,817
2026 | ​ | ​ | 5,279
Thereafter | ​ | ​ | 52,117
Total undiscounted lease payments | ​ | ​ | 76,589
Less: Tenant allowance | ​ | ​ | (17,032)
Less: Imputed interest | ​ | ​ | (25,588)
Present value of lease payments | ​ | $ | 33,969
​ | ​ | ​ | ​
Lease liabilities - long-term | ​ | $ | 33,969
Summary of lease costs and cash disclosures | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 31,
​ | ​ | 2021 |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease cost | ​ | $ | 4,342 | ​ | $ | 2,503 | ​ | $ | 2,596
Variable lease cost | ​ | ​ | 58 | ​ | ​ | 150 | ​ | ​ | 80
Total lease costs | ​ | $ | 4,400 | ​ | $ | 2,653 | ​ | $ | 2,676
Cash paid for amounts included in | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
the measurement of lease liabilities | ​ | $ | 2,773 | ​ | $ | 2,233 | ​ | $ | 1,929
Weighted-average remaining lease term | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
—operating leases (in years) | ​ | ​ | 12.3 | ​ | ​ | 7.4 | ​ | ​ | 5.5
Weighted-average discount rate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
—operating leases | ​ | ​ | 5.8% | ​ | ​ | 5.5% | ​ | ​ | 5.5%

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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 http://asc.fasb.org/extlink&oid=123408670&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 http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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