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Other long-term assets (Details) (USD $)
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3 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Other long-term assets [Abstract] | |||
| Patents, trademarks and applications, net of accumulated amortization | $ 1,327,483us-gaap_FiniteLivedIntangibleAssetsNet | $ 1,336,951us-gaap_FiniteLivedIntangibleAssetsNet | |
| Goodwill | 387,239us-gaap_Goodwill | 387,239us-gaap_Goodwill | |
| Total other long-term assets | 1,714,722us-gaap_OtherAssetsNoncurrent | 1,724,190us-gaap_OtherAssetsNoncurrent | |
| Finite-lived assets, accumulated amortization | 531,790us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 507,644us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | |
| Future amortization | |||
| 2015 | 97,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths | ||
| 2016 | 97,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo | ||
| 2017 | 97,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree | ||
| 2018 | 97,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour | ||
| 2019 | 97,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive | ||
| Impairment charges | |||
| X | ||||||||||
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- Definition
Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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