Organization and Summary of Significant Accounting Policies Trade Accounts Receivable and Allowance for 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 [Roll Forward]
Balance at beginning of period	$ 0	$ 2	$ 20
Adjustments to costs and expenses-offs	(10)	(5)	(18)
Write-offs	12	3	0
Balance at end of period	$ 2	$ 0	$ 2
Accounts Receivable [Member] | Comcast [Member]
Concentration Risk [Line Items]
Customer concentration risk (in hundredths)	80.00%	78.00%
Accounts Receivable [Member] | Office Depot and OfficeMax [Member]
Concentration Risk [Line Items]
Customer concentration risk (in hundredths)		12.00%