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Provisions - Additional Information (Details)
 1 Months Ended 2 Months Ended 6 Months Ended
May 31, 2017
USD ($)
Jan. 31, 2016
lawsuit
Dec. 31, 2017
USD ($)
lawsuit
Disclosure of other provisions [line items]      
Cash payment for litigation settlment $ 43,000,000    
Class counsels attorneys fees 5,000,000    
Number of lawsuits on alleging unlawful practices | lawsuit   2 6
Provision sought for award of damages per work infringed     $ 150,000
Bottom Of Range      
Disclosure of other provisions [line items]      
Litigation settlement administration and notice costs 1,000,000    
Top of Range      
Disclosure of other provisions [line items]      
Litigation settlement administration and notice costs $ 2,000,000