Fair Value Measurement (Narrative) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Probability of default [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	75.00%	75.00%
Expected volatility [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	221.60%	220.40%
Expected volatility [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	221.60%	247.80%
Credit spread [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premium percentage added to credit spread	10.00%	10.00%
Convertible promissory notes, measurement input	22.28%	23.07%