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Stock Option Plan - Schedule of stock option activity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
2010 Plan    
Shares    
Beginning balance (in shares) 1,916  
Granted, (in shares) 0  
Exercised (in shares) 0  
Forfeited (in shares) 0  
Expired/Cancelled (in shares) (747)  
Ending balance (in shares) 1,169 1,916
Options exercisable (in shares) 1,169  
Options vested (in shares) 1,169  
Weighted- Average Exercise Price per Share($)    
Beginning balance (in dollars per share) $ 1,033.97  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 0  
Forfeited (in dollars per share) 0  
Expired/Cancelled (in dollars per share) 508.47  
Ending balance (in dollars per share) 1,369.78 $ 1,033.97
Options exercisable (in dollars per share) 1,369.78  
Options vested (in dollars per share) $ 1,369.78  
Weighted- Average Remaining Contractual Term (Years)    
Outstanding, weighted-average remaining contractual term 2 years 11 months 8 days 2 years 6 months 14 days
Options exercisable, weighted average remaining contractual term 2 years 11 months 8 days  
Options vested, weighted average remaining contractual term 2 years 11 months 8 days  
Aggregate Intrinsic Value($)    
Outstanding $ 0 $ 0
Exercisable 0  
Vested $ 0  
2020 Plan    
Shares    
Beginning balance (in shares) 4,743  
Granted, (in shares) 0  
Exercised (in shares) 0  
Forfeited (in shares) 0  
Expired/Cancelled (in shares) (10)  
Ending balance (in shares) 4,733 4,743
Options exercisable (in shares) 3,746  
Options vested (in shares) 3,746  
Weighted- Average Exercise Price per Share($)    
Beginning balance (in dollars per share) $ 3,874.89  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 0  
Forfeited (in dollars per share) 0  
Expired/Cancelled (in dollars per share) 2,708  
Ending balance (in dollars per share) 3,877.35 $ 3,874.89
Options exercisable (in dollars per share) 4,879.38  
Options vested (in dollars per share) $ 4,879.38  
Weighted- Average Remaining Contractual Term (Years)    
Outstanding, weighted-average remaining contractual term 5 years 11 months 12 days 6 years 8 months 4 days
Options exercisable, weighted average remaining contractual term 5 years 8 months 19 days  
Options vested, weighted average remaining contractual term 5 years 8 months 19 days  
Aggregate Intrinsic Value($)    
Outstanding $ 0 $ 0
Exercisable 0  
Vested $ 0