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STOCK-BASED AWARDS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Jul. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 23, 2018
Jan. 22, 2018
Weighted Average Grant Date Fair Value                    
Stock-based compensation expense       $ 2,973 $ 1,045 $ 9,408 $ 1,985      
Restricted Stock Awards                    
Stock-Based Awards                    
Vesting period           3 years        
Units                    
Outstanding-beginning of year (in shares) 540,000         540,000        
Granted at fair value (in shares)           346,000        
Vested (in shares)           (222,000)        
Forfeited (in shares)           (12,000)        
Outstanding-end of period (in shares)   540,000   652,000   652,000   540,000    
Weighted Average Grant Date Fair Value                    
Outstanding-beginning of year (in dollars per share) $ 17.05         $ 17.05        
Granted at fair value (in dollars per share)           70.06        
Vested (in dollars per share)           17.30        
Forfeited (in dollars per share)           47.76        
Outstanding-end of period (in dollars per share)   $ 17.05   $ 44.53   $ 44.53   $ 17.05    
Stock-based compensation expense       $ 2,700 1,045 $ 5,084 1,985      
Restricted Stock Awards | First year                    
Stock-Based Awards                    
Annual award vesting percentage           33.30%        
Restricted Stock Awards | Second year                    
Stock-Based Awards                    
Annual award vesting percentage           33.30%        
Restricted Stock Awards | Third year                    
Stock-Based Awards                    
Annual award vesting percentage           33.30%        
tZero.com, Inc.                    
Weighted Average Grant Date Fair Value                    
Noncontrolling interest, ownership percentage by parent                 80.00% 81.00%
Medici Ventures | Employee Stock Options                    
Stock-Based Awards                    
Vesting period           3 years   3 years    
Weighted Average Grant Date Fair Value                    
Restricted stock units authorized, percentage     10.00%              
Stock options granted in period (in shares)           19,700   74,750    
Value of stock options granted in period   $ 91   1,700   $ 1,700   $ 91    
Stock-based compensation expense       123 0 $ 134 0      
tZero.com, Inc. | Restricted Stock Awards                    
Units                    
Granted at fair value (in shares)           382        
Weighted Average Grant Date Fair Value                    
Restricted stock units authorized, percentage   5.00%                
Restricted stock units granted, percentage 1.00%                  
Stock-based compensation expense $ 4,000                  
Cumulative grant date fair value       3,100   $ 3,100        
tZero.com, Inc. | Employee Stock Options                    
Weighted Average Grant Date Fair Value                    
Stock-based compensation expense       $ 150 $ 0 $ 4,190 $ 0      
Minimum | tZero.com, Inc. | Restricted Stock Awards                    
Stock-Based Awards                    
Vesting period           2 years        
Maximum | tZero.com, Inc. | Restricted Stock Awards                    
Stock-Based Awards                    
Vesting period           3 years