Organization and Summary of Significant Accounting Policies, Segment Information, Revenue by Customer (Details) - Segment	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
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%
Revenue [Member] \| Customer Concentration Risk [Member] \| Comcast [Member]
Concentration Risk [Line Items]
Customer concentration risk	65.00%	60.00%
Revenue [Member] \| Customer Concentration Risk [Member] \| Office Depot [Member]
Concentration Risk [Line Items]
Customer concentration risk		15.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration