Organization and Summary of Significant Accounting Policies (Changes in Carrying Amount of Goodwill) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Basis, Balance, beginning of period	$ 6,322	$ 6,322	$ 6,322
Basis, Changes in Goodwill	0	0	0
Basis, Balance, end of period	6,322	6,322	6,322
Accumulated Amortization, Balance, beginning of period	1,073	1,073	1,073
Accumulated Amortization, Balance, end of period	1,073	1,073	1,073
Goodwill	$ 5,249	$ 5,249	$ 5,249	$ 5,249