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Basis of Presentation and Summary of Significant Accounting Policies - Impact of New Accounting Standard on Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets    
Prepaid expenses and other current assets $ 176,545 $ 151,102
Other assets 324,453 247,519
Liabilities    
Deferred tax liabilities 1,030,936 1,166,269
Stockholders' equity    
Accumulated deficit $ (3,206,845) $ (2,742,193)