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INTANGIBLES AND GOODWILL - Future amortization expense (Details)

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INTANGIBLES AND GOODWILL - Future amortization expense (Details) - Neuro Pro Monitoring - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Estimated future amortization expense of finite-lived intangible assets    
2022 $ 451  
2023 451  
2024 451  
2025 451  
2026 451  
Thereafter 1,277  
Finite-lived intangible assets, net $ 3,532 $ 3,998