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Income Taxes - Schedule of (Provision for) Benefit from Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income taxes:
Federal	$ (248)	$ (423)	$ (416)
State	(151)	(59)	(131)
Foreign	(1)	0	0
Total current income taxes	(400)	(482)	(547)
Deferred income taxes:
Federal	(409)	34	(6)
Total deferred income taxes	(409)	34	(6)
Total income tax (provision) benefit	$ (809)	$ (448)	$ (553)

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