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Fair Value Measurements (Details 1) (USD $)	6 Months Ended
Fair Value Measurements (Details 1) (USD $)	Mar. 31, 2013	Sep. 30, 2012
Fair Value Measurements Details 1
Derivative liabilities	$ 17,893,000	$ 19,925,000
Recorded new derivative liabilities	1,646,000
Change in estimated fair value recognized in results of operations	$ (3,678,000)

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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