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STOCK BASED COMPENSATION - Narrative (Details) - 2013 Plan - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | May 21, 2021 | Apr. 28, 2020 | Apr. 18, 2019 | Jul. 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock shares reserved for future issuance | 1,223,939 | 1,223,939 |  |  |  |
Stock-based compensation expense | $ 0.3 | $ 0.6 |  |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock shares reserved for future issuance |  |  | 1,500,000 | 350,000 | 66,000 | 20,000
Stock option vesting period |  | 10 years |  |  |  |

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