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Leases | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Leases | 5. Leases We lease 31,505 square feet of office space in Minneapolis, Minnesota, which houses our principal executive offices and our manufacturing facility. We lease this space under an operating lease agreement that commenced December 1, 2008 and was scheduled to expire August 31, 2024. On April 21, 2023, we extended the operating lease for our office space in Minneapolis, Minnesota for an additional 49 consecutive months through August 31, 2028. On November 7, 2023, we expanded our existing office space with the addition of 7,615 square feet of property adjacent to our principal executive offices and our manufacturing facility. The term on this expanded property is for 57 consecutive months that will run concurrently with the term on the existing lease. We intend to add new facilities as we grow, and we believe that suitable additional or substitute space will be available as needed to accommodate any such expansion of our operations. Our operating lease agreement includes an option to renew for one additional period of three years. The exercise of the lease renewal option is at our sole discretion and was not included in the lease term for the calculation of the ROU asset and lease liability, as it is not reasonably certain of exercise. ​ In addition to base rent, we also pay our proportionate share of operating expenses, as defined in the lease. These payments are made monthly and are adjusted annually to reflect actual charges incurred for operating expenses, such as common area maintenance, taxes and insurance. The following table presents the lease balances within the consolidated balance sheets:
​ | ​ | ​ | ​
​ |  | December 31,
(in thousands) | ​ | 2023
Right-of-use assets: | ​ | ​ | ​
Operating lease right-of-use asset | ​ | $ | 1,349
Operating lease liabilities: | ​ | ​ | ​
Accrued expenses | ​ | ​ | 231
Operating lease liability, non-current portion | ​ | ​ | 1,160
Total operating lease liabilities | ​ | $ | 1,391
​ Maturities of our lease liability for our operating lease are as follows as of December 31, 2023: ​
​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) | ​ | 2023
2024 | ​ | ​ | 315
2025 | ​ | ​ | 350
2026 | ​ | ​ | 362
2027 | ​ | ​ | 374
2028 | ​ | ​ | 223
Total undiscounted lease payments | ​ | ​ | 1,624
Less: imputed interest | ​ | ​ | (233)
Present value of lease liability | ​ | $ | 1,391
​ As of December 31, 2023, the remaining lease term was 4.7 years, and the weighted average discount rate was 6.7%. The operating cash outflows from our operating lease were $0.4 million for each of the years ended December 31, 2023 and 2022.

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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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//842-20/tableOfContent + Details
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