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COMMITMENTS AND CONTINGENCIES (Details)
ft² in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
Jun. 24, 2014
ft²
Future minimum annual payments          
2018 $ 289,000        
2019 26,000        
Thereafter 0        
Total minimum lease payments 315,000        
Operating Leases, Rent Expense, Net [Abstract]          
Lease expense 700,000 $ 800,000 $ 600,000    
Building          
Operating Leased Assets [Line Items]          
Area of space leased | ft²         18
Monthly lease rent $ 24,100        
Annual rent increase (percent)       3.00%