Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 24,000	$ 15,000
Stock options granted, shares
Stock options granted, exercise price
Remaining total unrecognized compensation cost related to unvested stock-based arrangements	$ 238,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition	3 years
Stock options exercised
Non-Statutory Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, shares	12,000	30,000
Stock options granted, exercise price	$ 2.31	$ 1.31
Stock options granted, per-share weighted average fair value	$ 1.96	$ 1.07
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, shares	110,421
Stock options granted, exercise price	$ 2.31
Stock options granted, per-share weighted average fair value	$ 1.96