Organization and Summary of Significant Accounting Policies (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Balance at beginning of period	$ 9	$ 19
Adjustments to costs and expenses	24	34
Write-offs	(20)	(44)
Balance at end of period	$ 13	$ 9