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Stockholders' Equity And Stock-Based Compensation Expense (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 | Nov. 22, 2022 | May 05, 2022 | Mar. 31, 2020 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of common stock upon exercise of stock options |  |  |  |  | $ 64,000 | $ 211,000 |
Vesting period of stock options |  |  |  |  | 4 years |  |
Stock-based compensation expense |  |  |  |  | $ 673,000 | $ 495,000 |
Par value per share |  |  |  |  | $ 0.001 |  | $ 0.001
ATM [Member] |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Number of shares issued | 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 |  |  | 5,000,000 |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Stock options exercised |  |  |  |  | 19,017 | 19,609 |
Proceeds from issuance of common stock upon exercise of stock options |  |  |  |  | $ 64,000 | $ 211,000 |
Stock options exercised, net settled in satisfaction of the exercise price |  |  |  |  | 5,139 | 5,121 |
Proceeds from stock options exercised net settled in satisfaction of the exercise price |  |  |  |  | $ 0 | $ 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 |  |  |  |  | $ 12.15 |  |
Vesting period of stock options |  |  |  |  | 2 years 3 months 18 days |  |
Stock-based compensation expense |  |  |  |  | $ 7,000,000.0 |  |
Performance Award [Member] |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 100,000 |  |
Common Stock [Member] | Registered Direct Offering 2022 [Member] |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Number of shares issued |  | 1,666,667 |  |  |  |  |
Price per share |  | $ 30.00 |  |  |  |  |
Proceeds from offering |  | $ 47,300,000 |  |  |  |  |

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