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Transition Costs - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
General and Administrative Expenses [Member]
Transition Costs [Line Items]
Non-cash charges associated with modifications to existing stock grants held by the retiring executives and expenses associated with the onboarding of the Company's new President and CEO	$ 0	$ 8,628,000

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- Definition

Non cash charges related to equity based compensation of retiring executives and expenses associated with onboarding new executives.

+ References

No definition available.

+ Details

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- Definition

Transition Costs.

+ References

No definition available.

+ Details

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- Details

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