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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
COMMITMENTS AND CONTINGENCIES |  |  |  |
Percentage of royalty on net revenue |  |  | 4.00% |
Royalty expense | $ 7 | $ 10 | $ 12 | $ 14

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