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Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares reserved for grant (in shares)     4,512,889    
Fair value of underlying common shares (in USD per share) $ 15     $ 15.00 $ 15.00
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       $ 0.6 $ 4.6
Employee and Non-employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)   602,743     1,337,657
Exercise price of options granted in period (in USD per share)   $ 2.38      
Employee and Non-employee Stock Option | Stock Option Grantees Holding More Than 10% of the Total Voting Power of the Company          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Threshold percentage of total voting power of company       10.00% 10.00%
Exercise price as a percentage of fair value       110.00% 110.00%
Contractual term         5 years
Restricted Share Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted (in shares)     1,128,222   1,128,222
Share-based compensation       $ 0.4 $ 0.8
Fair value of restricted stock granted (in USD per share)     $ 5.10    
Restricted Share Awards | Originally reported          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of restricted stock granted (in USD per share)     $ 1.52    
Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 572,568 541,544     1,276,458
Exercise price of options granted in period (in USD per share) $ 4.00 $ 2.38      
Share-based compensation       0.9 $ 1.2
Fair value of stock options granted (in USD per share) $ 12.78 $ 13.44      
Unrecognized compensation expense related to options for employees, officers, and directors       14.6 $ 14.6
Unrecognized compensation expense, period for recognition, related to options for employees, officers, and directors         3 years 8 months 1 day
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)   61,199     61,199
Exercise price of options granted in period (in USD per share)         $ 2.38
Share-based compensation       0.1 $ 0.2
Unrecognized compensation expense related to options for non-employees       $ 0.5 $ 0.5
Unrecognized compensation expense, period for recognition, related to options for non-employees         1 year 2 months 9 days