Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies ASC 842 adoption (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 14,937		$ 0
Operating lease liability	$ 16,799		$ 0
Other non-current assets | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 14,100
Other current and non-current liabilities | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability		$ 17,900