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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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