Fair Value Accounting (Fair Value Measurement) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013
Assets:
Cash and cash equivalents	$ 114,129	$ 20,687	$ 18,165	$ 16,104
Restricted cash	26	1,482
Liabilities:
Warrant liability	0	122
Recurring
Assets:
Cash and cash equivalents	114,129	20,687
Restricted cash	26	1,482
Liabilities:
Warrant liability	0	122
Recurring | Level 1 Quoted Prices in Active Markets for Identical Assets
Assets:
Cash and cash equivalents	114,129	20,687
Restricted cash	26	1,482
Liabilities:
Warrant liability	0	0
Recurring | Level 2 Significant Other Observable Remaining Inputs
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Liabilities:
Warrant liability	0	122
Recurring | Level 3 Significant Unobservable Inputs
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Liabilities:
Warrant liability	$ 0	$ 0