Income Taxes - Summary of Effective Tax Rate Differs from U.S. Federal Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Loss before income taxes:	$ (276,675)	$ (329,619)	$ (72,174)
Income tax benefits at statutory rate	(58,076)	(69,220)	(15,157)
Tax impact of foreign operations	(6,035)	(9,193)	(1,864)
Foreign exchange and other	(2,349)	1,015	1,399
Non-deductible expenses	1,576	483	5,331
Changes in enacted rates		(3)
Change in fair value of warrant liability	21,060
Stock based and other compensation	3,376	2,113
Change in valuation allowance	34,846	66,355	5,840
Income tax benefits, net	$ (5,602)	$ (8,450)	$ (4,451)

Income tax reconciliation change in fair value of warrant liability.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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