Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2010
Account:
Cash and cash equivalents	$ 20,245	$ 15,598	$ 18,829	$ 19,944
Restricted cash	571	544
Warrant liability	691	601
Recurring [Member]
Account:
Cash and cash equivalents	20,245	15,598
Restricted cash	571	544
Warrant liability	691	601
Recurring [Member] | Fair Value, Inputs, Level 1
Account:
Cash and cash equivalents	20,245	15,598
Restricted cash	571	544
Warrant liability	0	0
Recurring [Member] | Fair Value, Inputs, Level 2
Account:
Cash and cash equivalents	0	0
Restricted cash	0	0
Warrant liability	691	601
Recurring [Member] | Fair Value, Inputs, Level 3
Account:
Cash and cash equivalents	0	0
Restricted cash	0	0
Warrant liability	$ 0	$ 0