Equity (Schedule of Valuation Assumptions) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Black-Scholes weighted average assumptions:
Expected dividend rate	0.00%	0.00%	0.00%	0.00%
Expected stock price volatility rate	96.50%	103.90%	96.90%	105.20%
Risk-free interest rate	1.09%	1.00%	0.99%	0.90%
Expected term	6 years	5 years	6 years	5 years
Weighted average grant date fair value per share of stock option granted: (in dollars per share)	$ 4.28	$ 3.46	$ 3.94	$ 3.23