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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Loss Carryforwards [Line Items]
U.S. federal income tax rate			21.00%
Valuation allowance on federal deferred tax assets	$ 11,100,000		$ 11,100,000
Provision (benefit) for income taxes	(2,426,000)	$ (6,698,000)	$ 976,000	$ (10,741,000)
Percentage of provision (benefit) on pre-tax loss			2.00%	(26.00%)
IRS [Member] | Tax Year 2015 [Member]
Operating Loss Carryforwards [Line Items]
Income tax examination, changes to financial position, results of operations or cash flow	0		$ 0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Portion of state deferred tax assets, not able to be utilized before expiration	$ 5,200,000		$ 5,200,000

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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