Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 105,000	$ 62,000	$ 345,000
Additional provisions and interest related to prior years	70,000	43,000	51,000
Resolution of matters during the period	(16,000)	0	(334,000)
Balance at end of period	$ 159,000	$ 105,000	$ 62,000