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Significant Customers (Details) (Customer Concentration Risk) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Revenues |  |
Concentration Risk |  |
Concentration risk, percentage | 17.50% | 30.10%
Revenues | Customer A |  |
Concentration Risk |  |
Concentration risk, percentage | 17.50% | 19.20%
Revenues | Customer B |  |
Concentration Risk |  |
Concentration risk, percentage | 0.00% | 0.00%
Revenues | Customer C |  |
Concentration Risk |  |
Concentration risk, percentage |  | 10.90%
Gross accounts receivable |  |
Concentration Risk |  |
Concentration risk, percentage | 20.30% | 39.40%
Gross accounts receivable | Customer A |  |
Concentration Risk |  |
Concentration risk, percentage | 20.30% | 25.00%
Gross accounts receivable | Customer B |  |
Concentration Risk |  |
Concentration risk, percentage |  | 14.40%

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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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