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STOCKHOLDERS' EQUITY (DEFICIT) - SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 09, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation arrangement by share-based payment award [Line Items] |  |  |
Number of shares granted (in shares) | 665,000 |  |
Share-based compensation expense |  | $ 643 | $ 0
Income tax effect related to share-based compensation expense |  | 0 | $ 0
Total unrecognized compensation cost |  | $ 1,005 |
Period over which unrecognized compensation cost is expected to be recognized |  | 2 years 4 months 24 days |
Share-based Payment Arrangement, Tranche One |  |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |  |
Number of shares granted (in shares) | 605,000 |  |
Shares exercise price | $ 3.33 |  |
Shares vesting period | 3 years |  |
Shares expiration period | 10 years |  |
Share-based Payment Arrangement, Tranche Two |  |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |  |
Number of shares granted (in shares) | 60,000 |  |
Shares exercise price | $ 3.66 |  |
Shares vesting period | 3 years |  |
Shares expiration period | 5 years |  |
Share-based Payment Arrangement, Independent Director |  |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |  |
Number of shares granted (in shares) | 310,000 |  |
Share-based Payment Arrangement, Employee |  |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |  |
Number of shares granted (in shares) | 355,000 |  |
2018 Equity Incentive Plan |  |  |
Share-based compensation arrangement by share-based payment award [Line Items] |  |  |
Shares authorized and reserved for issuance (in shares) |  | 800,000 |
Number of shares available for grant (in shares) |  | 135,000 |

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