STOCK-BASED COMPENSATION - Stock option activity (Details) - Employee stock options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares
EQUITY
Period over which options expire	10 years
Options, share-based compensation arrangement rollforward
Outstanding options (in shares) | shares	831
Granted options (in shares) | shares	1,258
Exercised options (in shares) | shares	(62)
Canceled options (in shares) | shares	(78)
Outstanding options (in shares) | shares	1,949
Exercisable options (in shares) | shares	1,327
Expected to vest (in shares) | shares	622
Options, weighted-average exercise price share-based compensation arrangement rollforward
Outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 9.82
Granted weighted-average exercise price (in dollars per share) | $ / shares	14.24
Exercised weighted-average exercise price (in dollars per share) | $ / shares	1.90
Canceled weighted-average exercise price (in dollars per share) | $ / shares	19.22
Outstanding weighted-average exercise price (in dollars per share) | $ / shares	12.54
Exercisable weighted-average exercise price (in dollars per share) | $ / shares	8.54
Expected to vest weighted-average exercise price (in dollars per share) | $ / shares	$ 21.06
Options, share-based compensation arrangement additional disclosures
Outstanding Weighted Average Remaining Contractual Life (in years)	7 years 4 months 6 days
Exercisable Weighted Average Remaining Contractual Life (in years)	6 years 6 months 7 days
Expected to vest Weighted Average Remaining Contractual Life (in years)	9 years 1 month 20 days
Aggregate Intrinsic Value Outstanding | $	$ 12,655
Aggregate Intrinsic Value Exercisable | $	11,568
Aggregate Intrinsic Value Expected to vest | $	$ 1,087