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Business Segments and Significant Customers (Details 2) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  | 9 Months Ended | 12 Months Ended
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Sep. 30, 2012 Total Customer concentration risk Customer A | Sep. 30, 2011 Total Customer concentration risk Customer A | Sep. 30, 2012 Total Customer concentration risk Customer A | Sep. 30, 2011 Total Customer concentration risk Customer A | Sep. 30, 2012 Total Customer concentration risk Customer B | Sep. 30, 2011 Total Customer concentration risk Customer B | Sep. 30, 2012 Total Customer concentration risk Customer B | Sep. 30, 2011 Total Customer concentration risk Customer B | Sep. 30, 2011 Total Customer concentration risk Customer C | Sep. 30, 2011 Total Customer concentration risk Customer D | Sep. 30, 2012 Net accounts receivable Credit concentration item | Dec. 31, 2011 Net accounts receivable Credit concentration item | Sep. 30, 2012 Net accounts receivable Credit concentration One customer | Dec. 31, 2011 Net accounts receivable Credit concentration Four customers
Significant Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration risk | 36.00% | 37.00% | 27.00% | 27.00% | 34.00% | 17.00% | 32.00% | 14.00% | 14.00% | 13.00% |  |  | 100.00% | 96.00%
Number of customers |  |  |  |  |  |  |  |  |  |  | 1 | 4 |  |

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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 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 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 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 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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