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Significant Customers (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Revenues
Concentration Risk
Concentration risk, percentage	16.00%	29.00%
Revenues | Customer A
Concentration Risk
Concentration risk, percentage	16.00%	18.20%
Revenues | Customer B
Concentration Risk
Concentration risk, percentage	0.00%	10.80%
Gross accounts receivable
Concentration Risk
Concentration risk, percentage	31.00%	37.30%
Gross accounts receivable | Customer A
Concentration Risk
Concentration risk, percentage	21.00%	24.90%
Gross accounts receivable | Customer B
Concentration Risk
Concentration risk, percentage	10.00%	12.40%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

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=6927468&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=35750535&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=6927468&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=35750535&loc=d3e13537-108611

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