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REVENUE - Contract Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]        
Deferred revenue $ 1,639 $ 1,649 $ 1,698 $ 1,681
Revenue recognized in the period from amounts included in deferred revenue at the beginning of the period $ 93 $ 129