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Intangible assets - Narrative (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2012
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Dec. 31, 2011
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization expense | $ 33,896 | $ 23,992 |
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Product Certifications
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Capitalized finited lived intangible assets | 17,314 | 22,036 |
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Patents
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Capitalized finited lived intangible assets | $ 146,981 | $ 16,712 |
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Patents | Minimum
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Finited lived intangible assets, estimated useful life | 7 years | |
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Patents | Maximum
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Finited lived intangible assets, estimated useful life | 10 years | |
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- Details
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- Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of assets, excluding financial assets and goodwill, lacking physical substance with a finite life acquired. No definition available.
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- Definition
Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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