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Stockholders' Equity (ESPP) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 14,734 |  |  | 15,706 | 46,622 | 59,020
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in USD per share) |  | $ 26.32 |  |  | $ 18.96 | $ 26.32 | $ 15.60
ESPP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Risk-free interest rate |  | 0.10% | 0.09% | 0.09% |  |  |
Share-based compensation expense |  | $ 117 |  |  | $ 95 | $ 458 | $ 339
Dividend yield |  |  |  |  |  | 0.01% |
Expected volatility |  |  |  |  |  | 48.14% |
Expected holding period (years) |  | 9 months | 6 months | 3 months |  |  |
ESPP | Forecast |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Risk-free interest rate | 0.10% |  |  |  |  |  |
Expected holding period (years) | 1 year |  |  |  |  |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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