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Refundable Research and Development Credit and Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Expense Benefit Continuing Operations [Abstract]
Current income tax expense or benefits	$ 0	$ 0	$ 0	$ 0
Deferred income tax expense or benefits	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References

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- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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