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ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 1,468 $ 931 $ 809
Additions - charged to expense 1,971 1,360 1,620
Deductions - bad debts written off, net of recoveries (1,295) (823) (1,498)
Balance at end of period 2,333 1,468 931
Cumulative effect of new accounting principle      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 189 0 0
Balance at end of period   $ 189 $ 0