Stock Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended			1 Months Ended		9 Months Ended							1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Restricted Stock	Dec. 31, 2012 Restricted Stock	Sep. 30, 2013 Common Stock	Aug. 31, 2012 2012 Equity Incentive Plan	Sep. 30, 2013 2012 Equity Incentive Plan	Sep. 30, 2013 2012 Equity Incentive Plan Restricted Stock	Sep. 30, 2012 2012 Equity Incentive Plan Restricted Stock	Sep. 30, 2013 2012 Equity Incentive Plan Restricted Stock Minimum	Sep. 30, 2013 2012 Equity Incentive Plan Restricted Stock Maximum	Sep. 30, 2013 2012 Equity Incentive Plan Non Vested Stock Options	Sep. 30, 2012 2012 Equity Incentive Plan Non Vested Stock Options	Sep. 30, 2013 2012 Equity Incentive Plan Restricted Stock and Performance Shares	Aug. 31, 2012 Previously Approved Plans	Sep. 30, 2013 Previously Approved Plans Restricted Stock	Sep. 30, 2013 Previously Approved Plans Non Vested Stock Options	Sep. 30, 2012 Previously Approved Plans Non Vested Stock Options	Sep. 30, 2013 2012 Plan and Previously Approved Plans	Sep. 30, 2013 2012 Plan and Previously Approved Plans Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares initially authorized for issuance under equity incentive plan									300,000
Additional shares authorized for issuance under equity incentive plan									17,666
Shares ceased to be issuable																		17,666
Outstanding options to purchase shares of common stock	284,000		284,000		433,000																	284,000
Unvested restricted shares outstanding						374,497	312,501																374,497
Outstanding shares remained available for future grants										299,530
Restricted shares outstanding																			0
Weighted average fair value of options granted			$ 2.82	$ 1.28
Unrecognized compensation cost related to the nonvested options											$ 495,800	$ 700,000			$ 18,000	$ 9,000				$ 18,000	$ 9,000
Unrecognized compensation costs are expected to be recognized over a weighted average period (years)											2 years 4 months 24 days	1 year 8 months 12 days			6 months	1 year
Common stock outstanding								284,000
Vesting period													3 years	4 years
Performance based restricted stock granted																	167,500
Stock-based compensation expense	63,000	114,000	228,000	333,000													0
Service contingent restricted shares outstanding expected to vest																			374,497
Aggregate intrinsic value						$ 1,438,070