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Share-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for grant (in shares) 4,500,000 4,500,000 6,923,919
RSI Employees | Share-Based Compensation Allocated to the Company by RSL      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 200,000 $ 2,600,000  
Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted (in shares) 945,616 0  
Allocated share-based compensation $ 1,400,000    
Unrecognized compensation expense related to options for employees, officers, and directors $ 21,000,000    
Unrecognized compensation expense, period for recognition, related to options for employees, officers, and directors 3 years 5 months 20 days    
Restricted Share Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation $ 600,000 $ 18,298  
Unrecognized compensation expense related to options for employees, officers, and directors $ 10,900,000    
Unrecognized compensation expense, period for recognition, related to options for employees, officers, and directors 3 years 1 month    
Restricted stock awards granted (in shares) 600,000 1,100,000  
Non-employee Stock Option | RSI Employees | Stock Options Granted to Non-Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted (in shares) 0    
Restricted stock awards granted (in shares)   0  
Share-based compensation related to stock options granted to consultants $ 100,000    
Unrecognized compensation expense related to options for non-employees $ 200,000    
Unrecognized compensation expense, period for recognition, related to options for non-employees 8 months 10 days    
2016 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding (in shares) 2,400,000    
Weighted average exercise price (in dollars per share) $ 7.97