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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, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Prepaid expenses and other current assets | $ 198,967 | $ 210,212
Other assets | 403,902 | 363,587
Liabilities |  |
Deferred tax liabilities | 935,989 | 990,899
Stockholders' equity |  |
Accumulated deficit | $ (3,724,139) | $ (3,491,069)

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