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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect change in accounting principle $ 939,889 $ 1,052,230 $ 698,725 $ 866,204 $ 917,597 $ 1,018,413
Accumulated Deficit            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect change in accounting principle $ (3,142,089) (3,023,688) (3,393,088) $ (3,223,222) (3,167,752) (3,069,272)
Accumulated Deficit | Cumulative Effect Period Of Adoption Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect change in accounting principle   $ 0 $ (115)   $ 0 $ (55,885)