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STOCK-BASED AWARDS - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2017
Jul. 31, 2017
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Weighted Average Grant Date Fair Value          
Common stock, shares authorized     100,000,000   100,000,000
Common stock, shares issued     43,877,000   42,790,000
Stock-based compensation expense     $ 3,268,000 $ 3,985,000  
Restricted Stock Awards          
Units          
Outstanding-beginning of year (in shares)     1,051,000    
Granted at fair value (in shares)     436,000    
Vested (in shares)     (671,000)    
Forfeited (in shares)     (79,000)    
Outstanding-end of period (in shares)     737,000    
Weighted Average Grant Date Fair Value          
Outstanding-beginning of year (in dollars per share)     $ 26.22    
Granted at fair value (in dollars per share)     9.03    
Vested (in dollars per share)     23.96    
Forfeited (in dollars per share)     28.35    
Outstanding-end of period (in dollars per share)     $ 17.88    
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%    
Medici Ventures          
Weighted Average Grant Date Fair Value          
Common stock, shares authorized   1,500,000      
Common stock, shares issued     900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares     470,000    
Medici Ventures | Employee Stock Options          
Weighted Average Grant Date Fair Value          
Restricted stock units authorized, percentage   9.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0    
tZero.com, Inc. | Restricted Stock Awards          
Units          
Granted at fair value (in shares)     10,000    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount     $ 30,500    
Weighted Average Grant Date Fair Value          
Restricted stock units authorized, percentage 5.00%        
tZero.com, Inc. | Employee Stock Options          
Weighted Average Grant Date Fair Value          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0    
Maximum | tZero.com, Inc. | Restricted Stock Awards          
Stock-Based Awards          
Vesting period     2 years    
Equity Incentive Plan, One-Year Vesting | Restricted Stock Awards          
Stock-Based Awards          
Vesting period       1 year  
Units          
Granted at fair value (in shares)       502,765  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other Than Option, Cumulative Grant Date Fair Value       $ 8,600,000  
2017 Stock Option Plan | Medici Ventures | Employee Stock Options          
Weighted Average Grant Date Fair Value          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     130,000