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STOCK-BASED AWARDS (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Jul. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jan. 23, 2018
Jan. 22, 2018
Jul. 26, 2017
Units                
Outstanding-end of period (in shares)       688,830        
Weighted Average Grant Date Fair Value                
Stock-based compensation expense       $ 6,435,000 $ 940,000      
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)       322,000        
Vested (in shares)       (166,000)        
Forfeited (in shares)       (7,000)        
Outstanding-end of period (in shares)   540,000   689,000        
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)       73.22        
Vested (in dollars per share)       15.55        
Forfeited (in dollars per share)       52.75        
Outstanding-end of period (in dollars per share)   $ 17.05   $ 43.35        
Stock-based compensation expense       $ 2,384,000 940,000      
Restricted Stock Awards | Officers, Board Members, and Employees                
Units                
Granted at fair value (in shares)       322,092        
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 [Member] | Employee Stock Options                
Stock-Based Awards                
Stock options granted in period     74,750          
Value of stock options granted in period               $ 91,000
Weighted Average Grant Date Fair Value                
Restricted stock units authorized, percentage     10.00%          
Stock-based compensation expense       $ 11,000 0      
tZero.com, Inc. | Restricted Stock Awards                
Weighted Average Grant Date Fair Value                
Restricted stock units authorized, percentage   5.00%            
Restricted stock units granted, percentage 1.00%              
Stock-based compensation expense $ 4,000,000     $ 4,040,000 $ 0