Convertible Debentures (Convertible Debenture Activity) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended
	Jun. 12, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Convertible Debentures [Roll Forward]
Interest expense recognized			$ 4,717	$ 2,205	$ 7,264
Convertible Debentures [Member]
Convertible Debentures [Roll Forward]
Gross balance, beginning balance			18,328	2,493	19,101
Less: Discounts, beginning balance			(2,440)	(529)	(5,625)
Convertible debentures, net, beginning balance			15,888	1,964	13,476
Proceeds from convertible debentures, before allocations			0	14,664	5,465
Allocated to detachable warrants			0	(1,660)	(629)
Allocated to beneficial conversion feature			0	(140)	(96)
Allocated to conversion option liability			0	(467)	(153)
PIK interest	778
Issuance of common shares		12,392	(19,035)	0	(23,457)
Gross balance, ending balance			0	18,328	2,493
Less: Discounts, ending balance		(1,387)	0	(2,440)	(529)
Convertible debentures, net, ending balance			0	15,888	1,964
Interest expense recognized			3,147	1,526	6,588
Convertible Debentures [Member] | Convertible Debentures 2009 [Member]
Convertible Debentures [Roll Forward]
Recognition of unamortized debt discount upon conversion			0	0	1,112
Convertible Debentures [Member] | Interest Expense [Member]
Convertible Debentures [Roll Forward]
PIK interest			707	1,171	1,384
Amortization of debt discount			190	355	247
Recognition of unamortized debt discount upon conversion			$ 2,250	$ 0	$ 4,615