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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Short-term investments	$ 79,581,194	$ 66,677,156

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- Definition

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

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