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Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases |
Schedule of balance sheet information of operating leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | December 31,
(in thousands) |  | Classification |  | 2023 |  | 2022
ROU assets |  | Operating lease ROU assets | ​ | $ | 14,097 | ​ | $ | 16,706
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease liabilities |  |  | ​ |  |  | ​ |  |
Current |  | Accrued liabilities | ​ | $ | 3,160 | ​ | $ | 3,244
Noncurrent |  | Operating lease liabilities | ​ |  | 12,271 | ​ |  | 14,861
Total lease liabilities |  |  | ​ | $ | 15,431 | ​ | $ | 18,105
Schedule of components of lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021
Operating lease cost | ​ | $ | 4,131 | ​ | $ | 4,041 | ​ | $ | 4,836
Short-term lease cost | ​ |  | 412 | ​ |  | 447 | ​ |  | 169
Variable lease cost | ​ |  | 1,881 | ​ |  | 1,802 | ​ |  | 2,123
Total lease cost | ​ | $ | 6,424 | ​ | $ | 6,290 | ​ | $ | 7,128
Schedule of operating lease cash flow and noncash information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021
Operating lease cost | ​ | $ | 4,131 | ​ | $ | 4,041 | ​ | $ | 4,836
Short-term lease cost | ​ |  | 412 | ​ |  | 447 | ​ |  | 169
Variable lease cost | ​ |  | 1,881 | ​ |  | 1,802 | ​ |  | 2,123
Total lease cost | ​ | $ | 6,424 | ​ | $ | 6,290 | ​ | $ | 7,128
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021
Operating cash flows - cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | 6,157 | ​ | $ | 5,951 | ​ | $ | 6,568
Operating lease ROU assets obtained in exchange for lease liabilities, net (1) | ​ |  | 710 | ​ |  | 2,421 | ​ |  | 2,135
(1) Includes decreases to our ROU assets of $0.04 million, $0.2 million, and $0.3 million related to lease amendments and terminations during 2023, 2022 and 2021 respectively.
Schedule of lease supplemental information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​
Weighted average remaining lease term (in years) | ​ | 6.0 | ​ | 6.7 | ​ | 7.2 | ​
Weighted average discount rate | ​ | 4.9 | % | 4.7 | % | 4.6 | %
​
Schedule of maturities of lease liabilities | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2024 | ​ | $ | 3,577
2025 | ​ | ​ | 2,979
2026 | ​ |  | 2,556
2027 | ​ |  | 2,374
2028 | ​ | ​ | 2,193
Thereafter | ​ |  | 4,295
Total lease payments | ​ |  | 17,974
Less: Interest | ​ |  | (2,543)
Total lease liabilities | ​ | $ | 15,431
​

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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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + 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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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