Fair Value Accounting (Fair Value Measurement) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Assets:
Cash and cash equivalents	$ 111,885	$ 20,687	$ 16,104	$ 9,047
Restricted cash	375	1,482
Liabilities:
Warrant liability	0	122
Recurring [Member]
Assets:
Cash and cash equivalents	111,885	20,687
Restricted cash	375	1,482
Liabilities:
Warrant liability		122
Recurring [Member] | Level 1 Quoted Prices in Active Markets for Identical Assets [Member]
Assets:
Cash and cash equivalents	111,885	20,687
Restricted cash	375	1,482
Liabilities:
Warrant liability		0
Recurring [Member] | Level 2 Significant Other Observable Remaining Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Liabilities:
Warrant liability		122
Recurring [Member] | Level 3 Significant Unobservable Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Restricted cash	$ 0	0
Liabilities:
Warrant liability		$ 0