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FAIR VALUE MEASUREMENTS - Fair value measurements using significant unobservable inputs (Level 3) (Details) - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Balance at January 1, 2018 $ (433)
Payment of earn out liability 410
Adjustment due to change in the forecast of earn-out consideration $ 23