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Stock-based Compensation and Equity Grants - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021
Number of Shares |  |
Options outstanding, September 30, 2021 (in shares) | 2,374,000 |
Granted (in shares) | 250,000 |
Options outstanding, December 31, 2021 (in shares) | 2,624,000 | 2,374,000
Weighted Average Exercise Price |  |
Options outstanding, September 30, 2021 (in dollars per share) | $ 5.60 |
Granted (in dollars per share) | 16.01 |
Options outstanding, December 31, 2021 (in dollars per share) | $ 6.59 | $ 5.60
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 5 years 9 months 18 days | 5 years 7 months 6 days
Aggregate Intrinsic Value |  |
Options outstanding at September 30, 2021 | $ 15,899 |
Options outstanding at December 31, 2021 | 37,059 | $ 15,899
Stock compensation expense of option granted | $ 100 |

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