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Concentration and Major Customers and Suppliers (Details) | 12 Months Ended
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Dec. 31, 2012 Supplier Customer | Dec. 31, 2011 Supplier Customer | Dec. 31, 2010 Supplier
Concentration and major customers and suppliers (Textual) |  |  |
Number of major suppliers | 2 | 3 | 3
Number of customer contributed over 10% of total sales | 0 | 0 |
Supplier A [Member] |  |  |
Concentration and major customers and suppliers (Textual) |  |  |
Percentage of total purchase from major suppliers | 77.00% | 61.00% | 51.00%
Supplier B [Member] |  |  |
Concentration and major customers and suppliers (Textual) |  |  |
Percentage of total purchase from major suppliers | 8.00% | 11.00% | 13.00%
Supplier C [Member] |  |  |
Concentration and major customers and suppliers (Textual) |  |  |
Percentage of total purchase from major suppliers |  | 6.00% | 8.00%

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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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