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Stockholders' Equity (Narrative) (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 26, 2022 | Jan. 27, 2021 | Nov. 30, 2019 | Dec. 31, 2021 | Jan. 31, 2022 | Sep. 30, 2021 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  |  | $ 16,449 |  |  |
Forfeiture rate, Board of Directors |  |  |  | 0.00% |  |  |
Forfeiture rate, non-Board of Directors |  |  |  | 7.30% |  |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  |  | 2 years 3 months 18 days |  |  |
2017 Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of additional shares available for future grants |  | 1,500,000 |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vested contractual term, in years |  |  |  | 10 years |  |  |
Vesting period, in years |  |  |  | 4 years |  |  |
Stock Options [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  |  | 25.00% |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of additional shares available for future grants | 800,000 |  |  |  |  |  |
2019 Authorization [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500,000 | $ 26,742 |  |  |
Repurchase period in years |  |  | 3 years |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  | 233,000 |  |  | 0
2022 Authorization [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 800,000 |  |
2017 Authorization [Member] | 2017 Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for future grants |  |  |  | 2,281,000 |  | 2,714,000 |

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