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STOCK-BASED COMPENSATION - Stock based compensation, stock option activity (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
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