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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases |
Schedule of lease balance sheet information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Leases |  | ​ |  | December 31, |  | December 31,
(in thousands) | ​ | Classification | ​ | 2021 | ​ | 2020
Assets | ​ |  | ​ | ​ |  | ​ | ​ |
Operating | ​ | Operating lease right-of-use asset | ​ | $ | 28,142 | ​ | $ | 20,009
Finance | ​ | Finance lease right-of-use asset | ​ | ​ | 49,022 | ​ | ​ | 51,443
Total lease assets | ​ | ​ | ​ | $ | 77,164 | ​ | $ | 71,452
Liabilities | ​ |  | ​ | ​ |  | ​ | ​ |
Current | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | ​ | Accrued liabilities | ​ | $ | 1,010 | ​ | $ | 1,185
Noncurrent | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | ​ | Operating lease liability | ​ | ​ | 29,650 | ​ | ​ | 20,704
Finance | ​ | Finance lease liability | ​ | ​ | 72,699 | ​ | ​ | 60,690
Total lease liabilities | ​ |  | ​ | $ | 103,359 | ​ | $ | 82,579
Schedule of component of lease expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | Year Ended | ​ | Year Ended | ​
Lease Cost | ​ | ​ | December 31, | ​ | December 31, | ​
(in thousands) | ​ | Classification | 2021 | ​ | 2020 | ​
Fixed operating lease cost | ​ | Cost of sales | $ | 1,340 | ​ | $ | 757 | ​
​ | ​ | Research and development | ​ | 1,030 | ​ | ​ | 950 | ​
​ | ​ | Selling, general and administrative expenses | ​ | 2,049 | (a) | ​ | 2,132 | (a)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finance lease cost | ​ | Amortization of right-of-use asset included in Selling, general and administrative expenses | $ | 2,421 | ​ | $ | 2,424 | ​
Finance lease cost | ​ | Interest expense on lease liability | $ | 4,074 | ​ | $ | 3,596 | ​
(a)Includes short-term leases, which are immaterial. ​
Schedule of maturity of lease liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Maturity of Lease Liabilities | ​ | Operating | ​ | Finance
(in thousands) |  | Leases (a) |  | Leases (b)
2022 | ​ | $ | 3,367 | ​ | $ | —
2023 | ​ | ​ | 3,510 | ​ | ​ | 9,920
2024 | ​ | ​ | 3,290 | ​ | ​ | 5,184
2025 | ​ | ​ | 3,274 | ​ | ​ | 5,340
2026 | ​ | ​ | 3,359 | ​ | ​ | 5,500
Thereafter | ​ | ​ | 36,760 | ​ | ​ | 107,533
Total lease payments | ​ | $ | 53,560 | ​ | $ | 133,477
Less: imputed interest | ​ | ​ | 22,900 | ​ | ​ | 60,778
Total lease liabilities | ​ | $ | 30,660 | ​ | $ | 72,699
(a) | Operating lease payments include $20.8 million related to options to extend lease terms that are reasonably certain of being exercised.
(b) | Finance lease payments include $75.8 million related to options to extend lease terms that are reasonably certain of being exercised.
​
Schedule of operating and finance lease weighted average lease term and discount rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | ​ | December 31, | ​
Lease Term and Discount Rate |  | 2021 | ​ |  | 2020 | ​
Weighted-average remaining lease term (years) | ​ |  | ​ | ​ | ​ | ​
Operating leases | ​ | 13.6 | ​ | ​ | 12.2 | ​
Finance leases | ​ | 20.3 | ​ | ​ | 21.3 | ​
Weighted-average discount rate | ​ | ​ | ​ | ​ | ​ | ​
Operating leases | ​ | 7.9 | % | ​ | 7.7 | %
Finance leases | ​ | 6.0 | % | ​ | 6.0 | %
Schedule of operating and finance lease supplemental cash flow information | ​
​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended | ​ | Year Ended
Other Information | December 31, | ​ | December 31,
(in thousands) | 2021 | ​ | 2020
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​ | ​ | ​ | ​
Operating cash flows from operating leases | $ | 3,761 | ​ | $ | 2,859
Right-of-use asset obtained in exchange for lease obligations: | ​ | ​ | ​ | ​ | ​
Operating lease | $ | 10,496 | ​ | $ | 6,916
Finance lease | ​ | — | ​ | ​ | 181
Interest paid for finance lease | ​ | 4,074 | ​ | ​ | 1,160

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liability recognized in statement of financial position. + References No definition available. + Details
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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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