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RELATED-PARTY TRANSACTIONS - Transactions with The Palisades Group (Details) - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Apr. 06, 2015
Jul. 01, 2013
Mar. 31, 2018
May 05, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]              
Expenses from transactions with related parties $ 263,000            
Subsidiaries | Immediate Family Member of Chief Executive Officer, Brother | Consulting Agreement              
Related Party Transaction [Line Items]              
Consulting agreement term   5 years          
Consulting agreement minimum payment   $ 30,000          
Consulting agreement payment   $ 600,000          
Expenses from transactions with related parties       $ 0 $ 30,000 $ 1,200,000 $ 121,000
Written notice period for agreement termination     30 days