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RELATED-PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Accounts receivable, related parties $ 800   $ 800   $ 1,400
Hardware and other related revenue          
Related Party Transaction [Line Items]          
Revenue from related parties 30 $ 10 100 $ 10  
Software revenue          
Related Party Transaction [Line Items]          
Revenue from related parties $ 100 $ 100 $ 200 $ 100