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Business Segments and Significant Customers (Details 2) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 Total revenues Customer concentration risk Customer A | Jun. 30, 2012 Total revenues Customer concentration risk Customer A | Jun. 30, 2013 Total revenues Customer concentration risk Customer A | Jun. 30, 2012 Total revenues Customer concentration risk Customer A | Jun. 30, 2013 Total revenues Customer concentration risk Customer B | Jun. 30, 2012 Total revenues Customer concentration risk Customer B | Jun. 30, 2013 Total revenues Customer concentration risk Customer B | Jun. 30, 2012 Total revenues Customer concentration risk Customer B | Jun. 30, 2012 Total revenues Customer concentration risk Customer C | Jun. 30, 2013 Net accounts receivable Credit concentration One customer Item | Dec. 31, 2012 Net accounts receivable Credit concentration Three customers Item
Significant Customers |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration risk | 53.00% | 19.00% | 42.00% | 24.00% | 10.00% | 35.00% | 12.00% | 31.00% | 11.00% | 94.00% | 100.00%
Number of customers |  |  |  |  |  |  |  |  |  | 1 | 3

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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=7491637&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=7491637&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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