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Leases | 3 Months Ended
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Mar. 31, 2026
Leases |
Leases | 5. Leases We lease 35,183 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. On May 20, 2025, we further increased our office space by leasing an additional 3,678 square feet of the contiguous property. The term on this expanded property is for 40 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 condensed consolidated balance sheets:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | March 31, | ​ | December 31,
(in thousands) | ​ | 2026 | ​ | 2025
Right-of-use assets: | ​ | ​ | ​ | ​ | ​ | ​
Operating lease right-of-use asset | ​ | $ | 793 | ​ | $ | 878
Operating lease liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Accrued expenses | ​ | ​ | 361 | ​ | ​ | 352
Operating lease liability, non-current portion | ​ | ​ | 544 | ​ | ​ | 638
Total operating lease liabilities | ​ | $ | 905 | ​ | $ | 990
​ Maturities of our lease liability for our operating lease are as follows as of March 31, 2026: ​
​ | ​ | ​ | ​
​ | ​ | March 31,
(in thousands) | ​ | 2026
2026 | ​ | ​ | 308
2027 | ​ | ​ | 424
2028 | ​ | ​ | 253
Total undiscounted lease payments | ​ | ​ | 985
Less: imputed interest | ​ | ​ | (80)
Present value of lease liability | ​ | $ | 905
​ As of March 31, 2026, the remaining lease term was 2.4 years, and the weighted average discount rate was 7.1%. The operating cash outflows from our operating lease were $0.2 million and $0.1 million for the three months ended March 31, 2026 and 2025.

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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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