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Stock-based Compensation and Equity Grants - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Number of Shares |  |
Outstanding at September 30, 2020 (in shares) | 2,374 |
Granted (in shares) | 275 |
Exercised (in shares) | (257) |
Outstanding at September 30, 2021 (in shares) | 2,392 | 2,374
Weighted Average Exercise Price |  |
Outstanding at September 30, 2020 (in dollars per share) | $ 5.60 |
Granted (in dollars per share) | 16.17 |
Exercised (in dollars per share) | 3.47 |
Outstanding at September 30, 2021 (in dollars per share) | $ 7.05 | $ 5.60
Weighted Average Remaining Contractual Term (in years) |  |
Outstanding at September 30, 2020 | 5 years 4 months 24 days | 5 years 7 months 6 days
Outstanding at September 30, 2021 | 5 years 4 months 24 days | 5 years 7 months 6 days
Aggregate Intrinsic Value |  |
Outstanding at the September 30, 2020 | $ 15,899 |
Options outstanding at September 30, 2021 | $ 13,566 | $ 15,899
Stock Options |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Volatility rate | 50.00% |
Term | 10 years |
Stock price threshold term | 10 days |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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