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STOCK BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | May 21, 2021 | Apr. 28, 2020 | Apr. 18, 2019 | Jul. 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average remaining term for stock options outstanding | 8 years 6 months |  |  |  |  |
Unrecognized compensation costs related to non-vested stock options | $ 0.1 |  |  |  |  |
Unrecognized compensation costs related to non-vested stock options, period recognized | 6 months |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation costs related to non-vested stock options, period recognized | 2 years |  |  |  |  |
Unrecognized compensation costs related to non-vested stock units, period recognized | $ 0.4 |  |  |  |  |
2013 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock shares reserved for future issuance | 1,236,658 |  |  |  |  |
Stock-based compensation expense | $ 0.9 | $ 0.4 |  |  |  |
2013 Plan | 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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