Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-based compensation	$ 100,000	$ 100,000	$ 338,139	$ 637,487
Company options granted to employees, in shares			88,749	104,375
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value			$ 3.52	$ 4.00
Cash received from option exercised	$ 10,300		$ 10,263
Option exercised		0		0