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REVENUE (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
REVENUE      
Contract assets $ 19,975 $ 19,975 $ 20,431
Contract assets, increase (decrease)   (456)  
Deferred revenue 2,289 2,289 2,595
Contract liabilities     $ 2,200
Revenue recognized of the entire opening balance of our contract liabilities $ 400 $ 1,400