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Income Taxes - Summary of Benefit for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ 0	$ 0
State	0	0	0
Foreign	0	0	0
Subtotal	0	0	0
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	0	0	0
Subtotal	0	0	0
Income tax benefit	$ 0	$ 0	$ 0

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