Stock-Based Compensation - Additional Information (Detail) (USD $)	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 49,000	$ 31,000
Stock options granted, shares	122,421
Stock options granted, exercise price	$ 2.31
Remaining total unrecognized compensation cost related to unvested stock-based arrangements	$ 213,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition	2 years 9 months
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