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Business Segments, Concentration of Credit Risk and Significant Customers - Significant Customers (Details) - customer	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total revenues | Customer concentration risk | Customer A
Significant Customers
Percentage of concentration risk	34.00%
Total revenues | Customer concentration risk | Customer B
Significant Customers
Percentage of concentration risk	31.00%	34.00%	41.00%
Total revenues | Customer concentration risk | Customer C
Significant Customers
Percentage of concentration risk	12.00%	31.00%
Total revenues | Customer concentration risk | Customer D
Significant Customers
Percentage of concentration risk		11.00%	13.00%
Net accounts receivable | Credit concentration | Three customers
Significant Customers
Percentage of concentration risk	94.00%
Number of customers	3
Net accounts receivable | Credit concentration | Two customers
Significant Customers
Percentage of concentration risk		97.00%
Number of customers		3

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- Definition

Represents the number of customers on whom the entity relies significantly giving rise to concentration of risk.

+ References

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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

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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

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-Name Accounting Standards Codification
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