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Leases | 12 Months Ended
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Dec. 31, 2022
Leases |
Leases | Note 18 - Leases Lease Obligations We determine if an arrangement is a lease at inception. Operating lease right-of-use (“ROU”) assets and liabilities are recognized based on the present value of future minimum lease payments over the lease term at commencement date. As most of our leases do not provide an implicit rate, we use our estimated incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. Additionally, we use the portfolio approach in determining the discount rate used to present value lease payments. We give consideration to our convertible notes, line of credit, macroeconomic factors as well as publicly available data for instruments with similar characteristics when estimating our incremental borrowing rates. The ROU asset also includes any lease payments made and initial direct costs incurred and excludes lease incentives. We have operating leases for office space and logistical functions. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. For leases beginning on or after January 1, 2019, we account for lease components separately from non-lease components for all asset classes. Our leases have remaining terms of less than 1 to approximately 11 years, some of which include one or more options to renew for up to 5 years, and some of which include options to terminate the leases within 1 year. The exercise of lease renewal options is at our sole discretion and such options are included in ROU assets and liabilities for renewal periods that are reasonably certain of exercise. Certain of our lease agreements include stated rental payment escalations. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. We had no finance leases as of December 31, 2022. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Leases (in thousands) |  | Classification |  | December 31, 2022 |  | December 31, 2021
Assets |  |  |  | ​ |  | ​ | ​ | ​
Operating lease assets |  | Other assets | ​ | $ | 38,370 | ​ | $ | 23,270
Liabilities |  |  | ​ |  |  | ​ |  |
Current |  |  | ​ |  |  | ​ |  |
Operating |  | Other current liabilities | ​ | $ | 6,357 | ​ | $ | 6,540
Noncurrent |  |  | ​ |  |  | ​ |  | ​
Operating |  | Other long-term liabilities | ​ |  | 37,143 | ​ |  | 20,440
Total lease liabilities |  |  | ​ | $ | 43,500 | ​ | $ | 26,980
​ The components of operating lease expense were as follows for the years ended December 31 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Classification |  | 2022 | ​ | 2021 | ​ | 2020
Operating lease expense |  | Sales, general and administrative expenses (1) | ​ | $ | 4,388 | ​ | $ | 3,820 | ​ | $ | 3,762
​ |  | Research and development expense | ​ |  | 4,315 | ​ | ​ | 3,675 | ​ | ​ | 2,995
​ |  | Total operating lease expense (2) | ​ | ​ | 8,703 | ​ | ​ | 7,495 | ​ | ​ | 6,757
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Sublease income |  | Other income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (55)
Net lease expense | ​ | ​ | ​ | $ | 8,703 | ​ | $ | 7,495 | ​ | $ | 6,702
(1) | An immaterial portion of operating lease expense is included within cost of sales.
(2) | Includes short-term leases, which are immaterial.
​ Other information related to leases was as follows (in thousands, except lease term and discount rate):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Twelve Months Ended |  | ​ | Twelve Months Ended |
​ | ​ | December 31, 2022 |  | ​ | December 31, 2021 |
Supplemental Cash Flows Information |  | ​ |  | ​ | ​ | ​ |  | ​
Cash paid for amounts included in the measurement of lease liabilities: |  | ​ |  | ​ | ​ | ​ |  | ​
Operating cash flows for operating leases | ​ | $ | 9,216 | ​ | ​ | $ | 7,506 | ​
Right-of-use assets obtained in exchange for lease liabilities: | ​ |  |  | ​ | ​ |  |  | ​
Operating leases | ​ |  | 21,815 | ​ | ​ |  | 6,726 | ​
Weighted average remaining lease term: | ​ |  |  | ​ | ​ |  |  | ​
Operating leases | ​ |  | 7.2 | years | ​ |  | 4.2 | years
Weighted average discount rate: | ​ |  |  | ​ | ​ |  |  | ​
Operating leases | ​ |  | 5.44 | % | ​ |  | 2.73 | %
​ Future minimum lease payments under non-cancellable leases as of December 31, 2022 were as follows (in thousands): ​
​ | ​ | ​ | ​
​ |  | Operating
2023 | ​ | ​ | 8,448
2024 | ​ |  | 8,936
2025 | ​ |  | 8,990
2026 | ​ |  | 5,374
2027 | ​ |  | 3,566
Thereafter | ​ |  | 20,579
Total minimum lease payments | ​ |  | 55,893
Less: Amount representing interest | ​ |  | (12,393)
Present value of lease payments | ​ | $ | 43,500
​ As of December 31, 2022, we do not have any leases that have not yet commenced that create significant rights and obligations for us.

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=77888251 + Details
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