Organization and Summary of Significant Accounting Policies - Leases (Details) - extension_option	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2014
Lessee, Lease, Description [Line Items]
Initial term of lease (in years)	10 years
Corporate Office Lease, Two Five-Year Extension Options
Lessee, Lease, Description [Line Items]
Initial term of lease (in years)		13 years
Number of extension options	2
Renewable term of lease (in years)	5 years
Minimum
Lessee, Lease, Description [Line Items]
Initial term of lease (in years)	3 years
Maximum
Lessee, Lease, Description [Line Items]
Initial term of lease (in years)	10 years