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Business combinations, Goodwill and Intangible assets - Estimated Aggregate Amortization Expense (Detail) (USD $)	Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
For year ended 12/31/2013	$ 348,840
For year ended 12/31/2014	582,226
For year ended 12/31/2015	472,090
For year ended 12/31/2016	63,564
Total estimated aggregate amortization expense	$ 1,466,720

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- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB

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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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