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RELATED-PARTY TRANSACTIONS - Legal Fees and Other Matters (Details) - Entity Affiliated with Former President and Chief Executive Officer
$ in Thousands
1 Months Ended 3 Months Ended 24 Months Ended
Feb. 28, 2018
letter_of_credit
Mar. 31, 2019
Mar. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2017
letter_of_credit
Legal Fees and Credit          
Related Party Transaction [Line Items]          
Legal services period (more than four months)   4 months      
Expenses from transactions with related parties | $     $ 330 $ 0  
Number of letters of credit outstanding         3
Number of letters or credit that were canceled 3        
Loans And Leases Receivable, Number Of Letters Of Credit Drawn, Related Party         0
Reimbursement of Legal Dispute          
Related Party Transaction [Line Items]          
Expenses from transactions with related parties | $     $ 100