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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award        
Share-based compensation expense, tax benefit recognized $ 0.0 $ 0.0 $ 0.0 $ 0.0
Closing Stock Price $ 6.75   $ 6.75  
Common shares under option plans        
Share Based Compensation Arrangement By Share Based Payment Award        
Unrecognized stock-based compensation expense related to unvested stock options $ 28.2   $ 28.2  
Unrecognized stock-based compensation expense related to non-vested options and/or RSUs, weighted-average remaining vesting period     1 year 9 months 18 days  
Restricted Stock Units (RSUs)        
Share Based Compensation Arrangement By Share Based Payment Award        
Unrecognized stock-based compensation expense related to unvested RSUs $ 49.1   $ 49.1  
Unrecognized stock-based compensation expense related to non-vested options and/or RSUs, weighted-average remaining vesting period     2 years 3 months 18 days