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STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 29, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
STOCK-BASED COMPENSATION |  |  |  |  |
Allocated Share-based Compensation Expense |  | $ 278 | $ 123 | $ 460 | $ 204
Weighted average estimated fair value of stock options granted |  |  |  | $ 6.64 | $ 3.41
CEO [Member] |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 40 |  |  |  |
Two Thousand Eighteen Equity Incentive Plan [Member] |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 663 |  | 663 |
Employee Stock Option [Member] |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  | $ 592 |  | $ 592 |
Employee Service Share-based Compensation, Non-vested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 1 month 6 days |
Restricted common shares |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  | $ 1,193 |  | $ 1,193 |
Employee Service Share-based Compensation, Non-vested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 1 year 10 months 24 days |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 132 |
Restricted common shares | Leadership team |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 132 |

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