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Stockholders' Equity And Stock-Based Compensation Expense (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 05, 2022 | Feb. 12, 2021 | Jan. 31, 2018 | Mar. 31, 2020 | Aug. 31, 2018 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 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 |  |  |  |  |  |  |  | $ 330,000 | $ 1,749,000 |  |
Proceeds from offering |  |  |  |  |  |  |  |  | 189,825,000 |  |
Proceeds from exercise of warrants |  |  |  |  |  | $ 0 | $ 0 |  | 692,000 |  |
Vesting period of stock options |  |  |  |  |  |  |  | 4 years |  |  |
Stock-based compensation expense |  |  |  |  |  | $ 485,000 | 415,000 | $ 980,000 | $ 665,000 |  |
Par value per share |  |  |  |  |  | $ 0.001 |  | $ 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 |  | 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 | 5,000,000 |  |  |  |  |  |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options exercised |  |  |  |  |  | 155,915 |  | 175,524 |  |  |
Proceeds from issuance of common stock upon exercise of stock options |  |  |  |  |  | $ 119,000 |  | $ 330,000 |  |  |
Stock options exercised, net settled in satisfaction of the exercise price |  |  |  |  |  | 89,278 |  | 94,399 |  |  |
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 |  |  |  |  |  | $ 11.06 |  | $ 11.06 |  |  |
Vesting period of stock options |  |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  | $ 5,400,000 |  |  |
Performance Award [Member] |  |  |  |  |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  | $ 100,000 |  |  |
Common Stock [Member] | 2021 Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  | 4,081,633 |  |  |  |  |  |  |  |  |
Price per share |  | $ 49.00 |  |  |  |  |  |  |  |  |
Proceeds from offering |  | $ 189,800,000 |  |  |  |  |  |  |  |  |

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