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Summary of significant accounting policies - Property, Plant and Equipment (Details)
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6 Months Ended | 12 Months Ended |
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Jun. 30, 2013
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Dec. 31, 2012
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Minimum
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| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, estimated useful lives | 3 years | 3 years |
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Maximum
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| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, estimated useful lives | 15 years | 7 years |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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