Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	370,500		370,500
Stock-based compensation expense	$ 0	$ 0	$ 17,000	$ 20,000
Unrecognized compensation expenses related to stock award	$ 0		$ 0
Options granted			7,500	7,000
Options vested			7,500	7,000
Aggregate fair value of options granted			$ 17,000	$ 20,000