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Stock-based Compensation and Equity Grants - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020
Number of Shares |  |
Options outstanding, September 30, 2020 (in shares) | 2,129,000 |
Exercised (in shares) | (63,000) |
Granted (in shares) | 245,000 |
Cancelled (in shares) | (35,000) |
Options outstanding, June 30, 2021 (in shares) | 2,276,000 | 2,129,000
Weighted Average Exercise Price |  |
Options outstanding, September 30, 2020 (in dollars per share) | $ 6.14 |
Exercised (in dollars per share) | 3.62 |
Granted (in dollars per share) | 10.04 |
Cancelled (in dollars per share) | 7.36 |
Options outstanding, June 30, 2021 (in dollars per share) | $ 0 | $ 6.14
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 7 years 4 months 24 days | 7 years 4 months 24 days
Aggregate Intrinsic Value |  |
Options outstanding at September 30, 2020 | $ 6,593 |
Options outstanding at June 30, 2021 | $ 15,385 | $ 6,593

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