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STOCK-BASED COMPENSATION AND WARRANTS - RSI Redeemable Warrants (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 10, 2017
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding     3,378   18,128   3,378  
Value at issuance             $ 10,331  
Loss (gain) from changes in fair value $ 16,352           (3,062)  
Warrant liability 23,621   $ 7,269       $ 7,269  
Volatility (percentage)         31.00% 33.00% 37.00%  
Risk-free interest rate (percentage)         2.80% 1.90% 1.40%  
Overall discount rate     25.00%          
Original Warrants                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding     2,651 2,700     2,651  
Value at issuance       $ 8,800     $ 8,847  
Loss (gain) from changes in fair value 12,833           (3,142)  
Warrant liability 18,538   $ 5,705       $ 5,705  
Anti-Dilution Warrant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding     727       727  
Value at issuance             $ 1,484  
Loss (gain) from changes in fair value 3,519           80  
Warrant liability $ 5,083   $ 1,564       $ 1,564  
Anti-dilution Warrants                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Warrant liability         $ 23,600      
Warrant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Discount rate for lack of marketability (percentage)   6.00%            
Overall discount rate 20.00%              
Business acquisition share price (usd per share) $ 10.00              
Minimum | Warrant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Projected revenue multiples   1.7 1.7          
Volatility (percentage)   46.00% 44.00%          
Risk-free interest rate (percentage) 1.10% 1.10% 0.50%          
Discount rate for lack of marketability (percentage)     26.00%          
Maximum | Warrant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Projected revenue multiples   1.8 2.0          
Volatility (percentage) 48.00% 48.00% 65.00%          
Risk-free interest rate (percentage)   1.50% 1.40%          
Discount rate for lack of marketability (percentage)     31.00%          
Redeemable Origination Agent Warrants | Original Warrants                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding         3,440      
Redeemable Origination Agent Warrants | Merger Warrant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding         3,400      
Redeemable Origination Agent Warrants | Anti-Dilution Warrant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding               700