Equity Incentive Plans (Assumptions Used in the Black-Scholes Model) (Details) - Common Stock Options [Member]	Mar. 31, 2021
Measurement Input, Price Volatility [Member]
Fair value input, equity securities	93.37
Measurement Input, Expected Dividend Rate [Member]
Fair value input, equity securities	0
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Fair value input, equity securities	0.93
Minimum [Member] | Measurement Input, Expected Term [Member]
Fair value input, equity securities	5.50
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Fair value input, equity securities	1.29
Maximum [Member] | Measurement Input, Expected Term [Member]
Fair value input, equity securities	7.00