Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 41,421	$ 10,314	$ 4,710	$ 5,203
Restricted cash	837	1,190	1,572	3,046
Cash, cash equivalents and restricted cash	$ 42,258	$ 11,504	$ 6,282	$ 8,249