Income Taxes - Summary of Significant Components of Net Deferred Tax Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accrued expenses	$ 30,169	$ 23,719
Intangible assets	183,441	175,397
Stock-based compensation	61,885	41,246
Loss carryforwards	2,631,230	1,714,870
Tax credit carryforwards	715,844	460,302
Lease liability	93,312	80,794
Other	29,572	6,374
Total deferred tax assets	3,745,453	2,502,702
Deferred tax liabilities:
Convertible debt		(138,832)
Right-of-use asset	(75,782)	(63,122)
Investments	(66,792)	(3,862)
Other	(2,549)	(3,532)
Total deferred tax liabilities	(145,123)	(209,348)
Total net deferred tax assets before valuation allowance	3,600,330	2,293,354
Valuation allowance	(3,611,242)	(2,293,361)
Net deferred taxes	$ (10,912)	$ (7)

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