XML 57 R45.htm IDEA: XBRL DOCUMENT v3.20.2
Net Loss per Share - Additional Information (Detail) - $ / shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Line Items]        
Exchange price $ 28.66   $ 28.66  
Exchangeable Senior Notes [Member]        
Earnings Per Share [Line Items]        
Securities excluded from computation of diluted net loss per share 12.4   13.1  
Interest rate 2.50%   2.50%  
Exchange price $ 28.66   $ 28.66  
Equity Awards [Member]        
Earnings Per Share [Line Items]        
Securities excluded from computation of diluted net loss per share 9.7 8.8 12.0 8.8