Stock Plans and Stock Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended						3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Unvested Shares Non Employee Director	Dec. 31, 2013 Unvested Shares Non Employee Director	Mar. 31, 2014 Unvested Shares Employee	Mar. 31, 2014 2006 Non-Employee Directors Stock Ownership Incentive Plan	May 16, 2012 2006 Non-Employee Directors Stock Ownership Incentive Plan	May 15, 2006 2006 Non-Employee Directors Stock Ownership Incentive Plan	Mar. 31, 2014 2006 Stock Incentive Plan	Feb. 23, 2006 2006 Stock Incentive Plan	Mar. 31, 2014 2006 Stock Incentive Plan Unvested Shares	Mar. 31, 2014 2006 Stock Incentive Plan Unvested Shares Minimum	Mar. 31, 2014 2006 Stock Incentive Plan Unvested Shares Maximum	May 31, 2013 2006 Stock Incentive Plan Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized							400,000	100,000		1,263,050				800,000
Unvested shares granted			47,428	182,355							831,163
Shares remaining available for issue						113,362			295,763
Award vesting period												3 years	10 years
Restricted shares award, fair market value						$ 25,000
Fair value of unvested shares issued					52,000
Fair value of unvested shares issued per weighted-average share				$ 0.85	$ 0.96
Stock-based compensation	$ 133,000	$ 103,000