Summary of Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Concentration Risk [Line Items]
Accounts Receivable	$ 713				$ 2,544				$ 713	$ 2,544
Revenue	1,386	$ 57,565	$ 48,521	$ 14,779	1,631	$ 26,517	$ 35,600	$ 17,533
Tropicana
Concentration Risk [Line Items]
Accounts Receivable	$ 0				$ 1,797				0	1,797
Revenue									$ 108,318	$ 70,396	$ 111,197
Tropicana | Total Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
% of Total Revenue									88.60%	86.60%	85.60%