Organization and Summary of Significant Accounting Policies - Accounting Change (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Operating lease right-of-use assets		$ 2,427
Operating lease liabilities		2,619
Right-of-use assets		13
Financing lease obligations		$ 14
Accounting Standards Update 2016-02 [Member]
Schedule Of Equity Method Investments [Line Items]
Operating lease right-of-use assets	$ 2,200
Operating lease liabilities	2,400
Cumulative effect adjustment to retained earnings	(66)
Right-of-use assets	(18)
Financing lease obligations	$ (18)