Organization and Summary of Significant Accounting Policies - Allowance For Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts [Roll Forward]
Balance at beginning of year	$ 885	$ 734	$ 824
Additions charged to expense	896	312	339
Reversal to expense	(50)	0	0
Write-offs charged against the allowance	(583)	(151)	(444)
Foreign currency translation (loss) gain	(5)	(10)	15
Balance at end of year	$ 1,143	$ 885	$ 734