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COMMON STOCKHOLDERS' EQUITY (Details) - USD ($)
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares issued (in shares)   48,064,707 48,012,432
Common stock, shares outstanding (in shares)   48,064,707 48,012,432
Subsequent Event | ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of market value discount 90.00%    
Maximum payroll deduction 10.00%    
Maximum number of shares per employee (in shares) 2,000    
Maximum value of shares per employee $ 25,000