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RETIREMENT SAVINGS PLAN (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]    
Discretionary employer contributions (as a percent) 50.00%  
Maximum discretionary employer contribution $ 500  
Matching contribution expense $ 5,000 $ 5,000
Minimum    
Defined Contribution Plan Disclosure [Line Items]    
Base pay that can be contributed by employees through salary deferrals (as a percent) 1.00%  
Maximum    
Defined Contribution Plan Disclosure [Line Items]    
Base pay that can be contributed by employees through salary deferrals (as a percent) 60.00%