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STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | 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 | $ 31,700 |  | $ 31,700 |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  | 2 years 4 months 24 days |  |  |  |  |  |
Purchase of common stock (in shares) | 484,635 |  | 484,635 |  |  | 651,269 |  |  |
Recognized compensation expense | $ 3,888 | $ 2,704 | $ 7,318 | $ 5,146 |  |  |  |  |
Options granted (in shares) |  |  | 0 | 0 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognized compensation expense | 0 | 0 | $ 0 | $ 0 |  |  |  |  |
Unrecognized compensation expense related to options outstanding | $ 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 7 months 6 days |  |  |  |  |  |
Awards outstanding (in shares) | 2,673,936 |  | 2,673,936 |  |  | 2,188,296 |  |  |
Recognized compensation expense | $ 2,600 | 1,900 | $ 4,900 | 3,500 |  |  |  |  |
Unrecognized compensation expense related to nonvested awards | $ 23,300 |  | $ 23,300 |  |  |  |  |  |
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 |  |  |  |  |  |
Awards outstanding (in shares) | 1,256,663 |  | 1,256,663 |  |  | 730,393 |  |  |
Recognized compensation expense | $ 1,300 | $ 700 | $ 2,300 | 1,400 |  |  |  |  |
Unrecognized compensation expense related to nonvested awards | $ 8,300 |  | $ 8,300 |  |  |  |  |  |
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) | 4,345,217 |  | 4,345,217 |  |  |  |  |  |
2020 Plan | RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) | 2,448,032 |  | 2,448,032 |  |  |  |  |  |
2020 Plan | Performance RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) | 1,256,663 |  | 1,256,663 |  |  |  |  |  |
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) | 267,456 |  | 267,456 |  |  |  |  |  |
Prior Plans | RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) | 8,850 |  | 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 |  | 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 |  |  | $ 41 | $ 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 |  | 0 |  |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) | 177,054 |  | 177,054 |  |  |  |  |  |

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