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Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 0	$ 0	$ 0
State	2,061	1,161	53
Foreign	68	81	99
Deferred:
Federal	6,076	(85,624)	0
State	155	(2,127)	0
Foreign	(42)	(16)	(14)
Provision (benefit) for income taxes	$ 8,318	$ (86,525)	$ 138

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