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REVENUE RECOGNITION - Summary of Disaggregated Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]    
Total revenue $ 1,496 $ 294
Device    
Disaggregation Of Revenue [Line Items]    
Total revenue 715 200
Device | Point In Time    
Disaggregation Of Revenue [Line Items]    
Total revenue 715 200
Service    
Disaggregation Of Revenue [Line Items]    
Total revenue 781 94
Service | Over Time    
Disaggregation Of Revenue [Line Items]    
Total revenue $ 781 $ 94