Equity (Schedule of Valuation Assumptions) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Black-Scholes weighted average assumptions:
Expected dividend rate	0.00%	0.00%	0.00%	0.00%
Expected stock price volatility rate	93.40%	96.50%	93.80%	96.90%
Risk-free interest rate	1.90%	1.10%	1.90%	1.00%
Expected term (in years)	6 years	6 years	6 years	6 years
Weighted average grant date fair value per share of stock option granted (in dollars per share)	$ 3.76	$ 4.28	$ 3.79	$ 3.94