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           Convertible debt (Details) (USD $) 
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        6 Months Ended | |
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           Jun. 30, 2012 
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           Jun. 30, 2011 
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| Convertible Debt (Textual) | ||
| Proceed from convertible promissory note | $ 500,000 | |
| Conversion price of convertible promissory note | $ 0.85 | |
| Interest rate on convertible promissory note | 10.00% | |
| Term of convertible promissory note | 3 years | |
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- Details 
          
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- Definition 
          Term of convertible promissory note. No definition available. 
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- Definition 
          The price per share of the conversion feature embedded in the debt instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The average effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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