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ACCOUNTS RECEIVABLE, NET - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 669 $ 73 $ 10
Charges to expense 738 351 154
Charges (credits) to other accounts (deferred revenue) 68 620 (56)
Write-offs (562) (375) (35)
Balance at end of year $ 913 $ 669 $ 73