Organization and Summary of Significant Accounting Policies Allowance for Sales Returns and Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable and Sales Returns [Roll Forward]
Balance at beginning of year	$ 1,452	$ 2,878	$ 2,024
Charged to revenue	884	776	2,190
Charged to (reversal of) expense	(91)	(180)	404
Utilization	(1,150)	(2,022)	(1,740)
Balance at end of year	$ 1,095	$ 1,452	$ 2,878