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Intangible Assets - Expected remaining amortization expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Intangible Assets      
2025 $ 63 $ 63  
2026 63 63  
2027 63 63  
2028 63 63  
2029   63  
Thereafter   70  
Total intangible assets, net $ 354 $ 385 $ 448