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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, 2020 | Sep. 30, 2020
Number of Shares |  |
Options outstanding, September 30, 2020 (in shares) | 2,129,000 |
Exercised (in shares) | (62,000) |
Granted (in shares) | 220,000 |
Options outstanding, December 31, 2020 (in shares) | 2,287,000 | 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) | 10.05 |
Options outstanding, December 31, 2020 (in dollars per share) | $ 6.95 | $ 6.14
Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 7 years 8 months 12 days | 7 years 4 months 24 days
Aggregate Intrinsic Value |  |
Options outstanding at September 30, 2020 (in dollars) | $ 6,593 |
Options outstanding at December 31, 2020 (in dollars) | 10,261 | $ 6,593
Total stock option expense | $ 100 |

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