Equity Incentive Plans (Assumptions Used in the Black-Scholes Model) (Details) - Common Stock Options [Member]	12 Months Ended
	Dec. 31, 2023 Y	Dec. 31, 2022 Y
Measurement Input, Expected Dividend Rate [Member]
Fair value input, equity securities	0	0
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Fair value input, equity securities		2.65
Minimum [Member] | Measurement Input, Price Volatility [Member]
Fair value input, equity securities	75.40	81.81
Minimum [Member] | Measurement Input, Expected Term [Member]
Fair value input, equity securities	0.12	5.50
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Fair value input, equity securities	5.54	4.20
Maximum [Member] | Measurement Input, Price Volatility [Member]
Fair value input, equity securities	116.96	85.86
Maximum [Member] | Measurement Input, Expected Term [Member]
Fair value input, equity securities	7.00	7.00