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STOCK-BASED COMPENSATION - Stock based compensation, stock option activity (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2021 USD ($) installment $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares
Options, share-based compensation arrangement rollforward |  |
Granted options (in shares) | 336,900 | 152,100
Options, share-based compensation arrangement additional disclosures |  |
Aggregate Intrinsic Value Exercised | $ | $ 2,503 | $ 562
Employee stock options |  |
EQUITY |  |
Number of installments over which options vest | installment | 3 |
Period over which options granted vest and become exercisable | 1 year |
Period over which options expire | 10 years |
Options, share-based compensation arrangement rollforward |  |
Outstanding options (in shares) | 712,000 |
Granted options (in shares) | 337,000 |
Exercised options (in shares) | (134,000) |
Forfeited options (in shares) | (74,000) |
Expired options (in shares) | (9,000) |
Outstanding options (in shares) | 831,000 | 712,000
Exercisable options (in shares) | 356,000 |
Options, weighted-average exercise price share-based compensation arrangement rollforward |  |
Outstanding weighted-average exercise price (in dollars per share) | $ / shares | $ 2.21 |
Granted weighted-average exercise price (in dollars per share) | $ / shares | 22.55 |
Exercised weighted-average exercise price (in dollars per share) | $ / shares | 1.83 |
Forfeited weighted-average exercise price (in dollars per share) | $ / shares | 9.98 |
Expired weighted-average exercise price (in dollars per share) | $ / shares | 1.98 |
Outstanding weighted-average exercise price (in dollars per share) | $ / shares | 9.82 | $ 2.21
Exercisable weighted-average exercise price (in dollars per share) | $ / shares | $ 2.00 |
Options, share-based compensation arrangement additional disclosures |  |
Outstanding Weighted Average Remaining Contractual Life (in years) | 7 years 9 months 18 days | 7 years 7 months 2 days
Exercisable Weighted Average Remaining Contractual Life (in years) | 6 years 3 months 14 days |
Aggregate Intrinsic Value Outstanding | $ | $ 17,058 | $ 1,939
Aggregate Intrinsic Value Exercisable | $ | $ 10,075 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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