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Business Segments, Concentration of Credit Risk and Significant Customers (Details 2) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Total revenues | Customer concentration risk | Customer A |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 41.00% | 28.00% | 23.00%
Total revenues | Customer concentration risk | Customer B |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 13.00% | 26.00% | 12.00%
Total revenues | Customer concentration risk | Customer C |  |  |
Significant Customers |  |  |
Percentage of concentration risk |  | 12.00% | 17.00%
Net accounts receivable | Credit concentration | Three customers |  |  |
Significant Customers |  |  |
Percentage of concentration risk |  | 100.00% |
Number of customers |  | 3 |
Net accounts receivable | Credit concentration | Two customers |  |  |
Significant Customers |  |  |
Percentage of concentration risk | 96.00% |  |
Number of customers | 2 |  |

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- Definition Represents the number of customers on whom the entity relies significantly giving rise to concentration of risk. + References No definition available. + Details
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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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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 3: 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=28364263&loc=d3e13531-108611 Reference 4: 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 + Details
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