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RELATED-PARTY TRANSACTIONS - Legal Fees and Other Matters (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 06, 2015
USD ($)
Feb. 28, 2018
letter_of_credit
Mar. 31, 2018
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
letter_of_credit
Related Party Transaction [Line Items]          
Expenses from transactions with related parties $ 263        
Entity Affiliated with Former President and Chief Executive Officer | 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 | letter_of_credit         3
Number of letters or credit that were canceled | letter_of_credit   3      
Entity Affiliated with Former President and Chief Executive Officer | Reimbursement of Legal Dispute          
Related Party Transaction [Line Items]          
Expenses from transactions with related parties       $ 100