Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Benefit [Line Items]
Income tax expense(benefit)	$ (2,945,000)	$ (490,000)
Effective tax rate	52.30%	39.10%
Pre-tax income or losses period	3 years
Deferred tax asset valuation allowance	$ 8,200,000		$ 8,200,000
Interest and penalties related to unrecognized tax benefits	0	$ 0
Uncertain tax portions	0
Cumulative adjustment to retained earnings	1,400,000
Stock Option Exercises [Member]
Income Tax Benefit [Line Items]
Income tax expense(benefit)	$ 241,000