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Short-term and Long-term investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortized Cost and Fair Value Debt Securities [Abstract]
Unrealized (losses) gains of available-for-sale securities, net of tax	$ (378,392)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	$ 25,467us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	$ 759,564us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Security considered held-to-maturity	$ 0us-gaap_HeldToMaturitySecurities	$ 0us-gaap_HeldToMaturitySecurities

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Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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