Fair Value Accounting (Fair Value Measurement) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011
Account:
Cash and cash equivalents	$ 5,922	$ 9,047	$ 24,112	$ 15,598
Restricted cash	330	82
Warrant liability	700	670
Recurring
Account:
Cash and cash equivalents	5,922	9,047
Restricted cash	330	82
Warrant liability	700	670
Recurring | Fair Value, Inputs, Level 1
Account:
Cash and cash equivalents	5,922	9,047
Restricted cash	330	82
Warrant liability	0	0
Recurring | Fair Value, Inputs, Level 2
Account:
Cash and cash equivalents	0	0
Restricted cash	0	0
Warrant liability	700	670
Recurring | Fair Value, Inputs, Level 3
Account:
Cash and cash equivalents	0	0
Restricted cash	0	0
Warrant liability	$ 0	$ 0