Organization and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Organization and Summary of Significant Accounting Policies
U.S. federal operating loss carryforwards	$ 2,800	$ 10,700
State net operating loss carryforwards	136,900	166,000
Net deferred tax assets	70,481	65,635
Valuation allowance	2,065	$ 8,930
Valuation allowance released	$ 7,100