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Income Taxes - Additional Information (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 53,600,000
Uncertain tax positions that required recognition	0	$ 0
Prior To December 31, 2017
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 42,800,000

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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- Definition

Amount of unrecognized tax benefits.

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