Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 193	$ 334	$ 174	$ 255
Statutory rate			34.00%	34.00%
Deferred tax assets, valuation allowances	600		$ 600		$ 600
Domestic deferred tax assets ratable reversal pattern period			15 years
Operating loss carry forward, expiration period			The carry forward rules allow for up to a 20 year carry forward of net operating losses
Net operating loss carry forward period			20 years
Average period required to utilize future income			26 years
Gross unrecognized tax benefit	$ 800		$ 800		$ 800