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EMPLOYEE BENEFIT PLAN (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Percentage of employee contributions matched 4.00%    
Maximum employer contribution per employee $ 2,500    
Matching contribution amount $ 100,000 $ 100,000 $ 100,000