Income Taxes - Schedule of Income Tax Provisions (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income before provision for income taxes	$ 1,199	$ 1,672	$ 3,367	$ 4,880
Provision for income taxes	$ (1,015)	$ (599)	$ (1,647)	$ (1,774)
Effective tax rate	84.70%	35.80%	48.90%	36.40%