Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Income Tax Contingency [Line Items]
Cumulative effect on retained earnings	$ 0
Unrecognized tax benefits	0
Deferred tax assets, increase in valuation allowance	$ 221,000
Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year	2004
Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year	2016