Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Jun. 30, 2012
Options (shares)
Beginning Balance	673
Exercised
Granted	170
Terminated	(172)
Ending Balance	671
Weighted Average Exercise Price
Beginning Balance	$ 2.65
Exercised
Granted	$ 1.38
Terminated	$ 4.17
Ending Balance	$ 1.94
Weighted Average Grant Date Fair Value
Beginning Balance	$ 1.83
Exercised
Granted	$ 1.12
Terminated	$ 2.59
Ending Balance	$ 1.45