Equity (Schedule of Valuation Assumptions) (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Black-Scholes weighted average assumptions:
Expected dividend rate	0.00%	0.00%	0.00%
Expected stock price volatility rate	96.70%	101.80%	99.40%
Risk-free interest rate	1.20%	0.80%	1.40%
Expected term (in years)	6 years	5 years 4 months 24 days	4 years 10 months 24 days
Weighted average grant date fair value per share of stock option granted (in dollars per share)	$ 3.45	$ 3.54	$ 4.44