Organization and Summary of Significant Accounting Policies, Segment Information, Revenue by Customer (Details) - Segment	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization and Summary of Significant Accounting Policies [Abstract]
Number of operating segments	1
Customers Outside United States [Member] | Maximum [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from external customers	1.00%	1.00%	1.00%
Revenue [Member] | Customer Concentration Risk [Member] | Comcast [Member]
Concentration Risk [Line Items]
Customer concentration risk	60.00%	68.00%	64.00%
Revenue [Member] | Customer Concentration Risk [Member] | Office Depot [Member]
Concentration Risk [Line Items]
Customer concentration risk	15.00%	15.00%	16.00%