Goodwill and intangible assets (Details 2) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible assets
Gross book value	$ 3,820,736	$ 4,115,888
Accumulated amortization	(1,774,036)	(1,294,979)
Net book value	2,046,700us-gaap_FiniteLivedIntangibleAssetsNet	2,820,909us-gaap_FiniteLivedIntangibleAssetsNet
Amortization period	5 years
Amortization expense	707,657us-gaap_AmortizationOfIntangibleAssets	735,265us-gaap_AmortizationOfIntangibleAssets	569,721us-gaap_AmortizationOfIntangibleAssets
Trademarks And Patents
Intangible assets
Gross book value	1,158,572	1,100,696
Accumulated amortization	(387,134)	(327,200)
Net book value	771,438	773,496
Trademarks And Patents \| Minimum
Intangible assets
Amortization period	15 years
Trademarks And Patents \| Maximum
Intangible assets
Amortization period	21 years
Technology
Intangible assets
Gross book value	2,662,164	3,015,192
Accumulated amortization	(1,386,902)	(967,779)
Net book value	$ 1,275,262	$ 2,047,413
Amortization period	5 years

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

+ References

No definition available.

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