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Stockholders' Equity And Stock-Based Compensation Expense (Narrative) (Details) - USD ($)		1 Months Ended		3 Months Ended
	Jan. 31, 2018	Mar. 31, 2020	Aug. 31, 2018	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	May 05, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Proceeds from issuance of common stock upon exercise of stock options				$ 211,000	$ 475,000
Proceeds from offering					189,825,000
Proceeds from exercise of warrants				$ 0	692,000
Vesting period of stock options				4 years
Stock-based compensation expense				$ 495,000	250,000
Par value per share				$ 0.001		$ 0.001
Common Stock Warrants [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Proceeds from issuance of common stock upon exercise of stock options					$ 700,000
Number of shares issued			9,100,000
Number of warrants outstanding					600,000
ATM [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Percentage of commission in ATM offering							3.00%
Number of shares issued				0	0
ATM [Member] | Maximum [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Aggregate offering price		$ 100,000,000
2018 Equity Incentive Plan [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Expiration period	10 years
Par value per share	$ 0.001
2018 Equity Incentive Plan [Member] | Maximum [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Shares issued	1,000,000
Stock Option [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock options exercised				19,609
Proceeds from issuance of common stock upon exercise of stock options				$ 211,000
Stock options exercised, net settled in satisfaction of the exercise price				5,121
Proceeds from stock options exercised net settled in satisfaction of the exercise price				$ 0
Stock Option [Member] | Stock Option And Performance Award [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Weighted average exercise price or options				$ 11.49
Vesting period of stock options				2 years
Stock-based compensation expense				$ 5,700,000
Performance Award [Member] | Stock Option And Performance Award [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense				$ 2,300,000

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