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Summary of Significant Accounting Policies - Share-Based Compensation (Details)
12 Months Ended
Jun. 19, 2015
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Revenue Based PRSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target shares an employee can earn     200.00%
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance based percentage   100.00%  
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan) | Revenue Based PRSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance based percentage   50.00%  
Vesting period   3 years  
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan) | Market Condition Based PRSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance based percentage   50.00%  
Vesting period   3 years  
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan) | Market Condition Based PRSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target shares an employee can earn   200.00%