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REVENUE (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
REVENUE    
Contract assets $ 24,485 $ 20,431
Contract assets, change 4,054  
Deferred revenue 818 2,595
Contract Liabilities   $ 2,300
Revenue recognized of the entire opening balance of our contract liabilities $ 1,800