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COMMITMENTS AND CONTINGENCIES - License Agreement (Details) - Advanced NeuroRehabilitation, LLC - License Agreement for Exclusive Right on Patent Pending Technology - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Commitments and Contingencies |  |  |  |
Percentage of royalty on net revenue |  |  | 4.00% |
Royalty expense | $ 10 | $ 5 | $ 14 | $ 12

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