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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 869 $ 951 $ 956
Provision 63 119 117
Write-offs, net of recoveries (267) (201) (122)
Balance at end of year $ 665 $ 869 $ 951