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INCOME TAXES - Summary of Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal income tax at statutory rates (34.00%) (34.00%) (34.00%)
Foreign income tax 0.50% 0.70% 4.00%
State income tax (5.00%) (5.00%) (4.00%)
Other permanent differences 0.40% 0.20% 0.00%
Statutory tax rate change - Deferred - Tax Reform Act (128.40%) (3.20%) 0.00%
Statutory tax rate change - Valuation Allowance - Tax Reform Act 128.40% 0.00% 0.00%
Compensation 0.00% 3.00% 3.00%
Goodwill impairment 0.00% 25.20% 0.00%
Refundable AMT credit (1.50%) 0.00%
Change in valuation allowance 40.10% 13.50% 24.00%
Effective tax rate 0.50% 0.40% (7.00%)