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INCOME TAXES - Operating Loss Carryforwards, Summary of Deferred Taxes and Temporary Tax Differences (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Noncurrent deferred income tax assets:    
Net operating loss carryforwards $ 79,966 $ 81,221
Intangible assets 19,021 22,886
Accrual and reserves 5,201 5,919
Other 52 75
Total noncurrent deferred tax assets 104,240 110,101
Valuation allowance (103,623) (109,336)
Noncurrent deferred tax assets, net of valuation allowance 617 765
Noncurrent deferred income tax liabilities:    
Fixed assets (617) (765)
Total noncurrent deferred tax liabilities (617) (765)
Movement in Valuation Allowances and Reserves [Roll Forward]    
Valuation allowance at the beginning of the period (109,336)  
Gross decrease for current year activity 5,713 (9,568)
Valuation allowance at the end of the period (103,623) $ (109,336)
Federal    
Operating loss carryforwards    
Net operating loss carryforwards 210,775  
State    
Operating loss carryforwards    
Net operating loss carryforwards $ 210,775