STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Oct. 02, 2023	Sep. 30, 2023	Jan. 31, 2020	Mar. 07, 2018	Mar. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to outstanding stock options and RSUs	$ 33,700
Weighted average period for unrecognized compensation expense expected to be recognized (in years)	2 years 8 months 12 days
Purchase of common stock (in shares)	554,635			651,269
Recognized compensation expense	$ 3,430	$ 2,442
Options granted (in shares)	0	0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)	2 years 10 months 24 days
Awards outstanding (in shares)	2,759,633			2,188,296
Recognized compensation expense	$ 2,300	$ 1,600
Unrecognized compensation expense related to nonvested awards	$ 24,600
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)	2 years 1 month 6 days
Awards outstanding (in shares)	1,203,203			730,393
Recognized compensation expense	$ 1,000	700
Unrecognized compensation expense related to nonvested awards	9,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	9	100
Unrecognized compensation expense related to options outstanding	$ 0
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)			5,108,000		4,500,000
Number of common stock reserved for future grants (in shares)	4,481,932
2020 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	2,381,995
2020 Plan | Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	1,203,203
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)					107,903
Purchase of common stock (in shares)	337,456
Prior Plans | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	8,850
ESPP common stock equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)						1,000,000
Number of common stock reserved for future grants (in shares)	270,876
Issuance of common stock under employee stock purchase plan (in shares)	729,124
Discount rate from market price, offering date	15.00%
Recognized compensation expense	$ 100	$ 100
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)							1,500,000
Number of common stock reserved for future grants (in shares)	0
Director Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)	259,513