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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Loss Carryforwards [Line Items]
U.S. federal income tax rate				21.00%
Tax reform adjustments to provision for income taxes		$ 0
Provision (benefit) for income taxes	$ (483,000)		$ (2,426,000)	$ (5,816,000)	$ 976,000
Percentage of benefit/provision on pre-tax loss				14.00%	2.00%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Portion of state deferred tax assets, not able to be utilized	$ 3,800,000			$ 3,800,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets valuation allowance				$ 8,900,000

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