Organization and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Dec. 31, 2017	Jan. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Federal statutory income tax rate	35.00%		24.50%
Tax provision recognized for the Act			$ 2.8
Deferred tax asset, provision for remeasurement			$ 2.8
Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Federal statutory income tax rate		21.00%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax rate used to remeasure deferred tax assets and liabilities			24.50%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax rate used to remeasure deferred tax assets and liabilities			21.00%