Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes Disclosure [Line Items]
Net deferred tax asset		$ 16,814,737	$ 18,429,737
Aggregate Federal NOL carryforwards		38,679,000
Federal NOLs subject to an annual limitation		5,961,000
Federal NOLs not subject to an annual limitation		32,718,000
Federal NOLs annual limitation		2,779,000
Aggregate Federal NOLs expiring		3,334,000
Federal NOL attributable to excess tax deductions		$ 1,723,000
Expirations of NOL		2024
Aggregate income tax payments		$ 722,105	651,502	$ 229,982
Unrecognized tax benefits and the related estimate for interest and penalties		154,000	159,000	105,000	$ 62,000
Additional general and administrative expense, including interest		$ (4,000)	$ 70,000	$ 43,000
New York State and New York City [Member]
Income Taxes Disclosure [Line Items]
Aggregate income tax payments	$ 16,000