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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, 2018
Dec. 31, 2017
Noncurrent deferred income tax assets:    
Net operating loss carryforwards $ 63,906 $ 56,619
Intangible assets 7,261 6,889
Accrual and reserves 2,502 2,402
Other 19 88
Total noncurrent deferred tax assets 73,688 65,998
Valuation allowance (73,129) (66,491)
Noncurrent deferred tax assets, net of valuation allowance 559  
Noncurrent deferred income tax liabilities:    
Noncurrent deferred tax assets, net of valuation allowance   (493)
Fixed assets 593  
Fixed assets   (152)
Total noncurrent deferred tax liabilities   (152)
Total noncurrent deferred tax liabilities 593  
Net deferred income tax liability (34) (341)
Reconciliation of the valuation allowances    
Valuation allowance at the beginning of the period (66,491)  
Gross increase for current year activity (6,638) 37,132
Valuation allowance at the end of the period (73,129) $ (66,491)
Federal    
Operating loss carryforwards    
Net operating loss carryforwards 248,717  
State    
Operating loss carryforwards    
Net operating loss carryforwards $ 228,787