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Fair Value Measurement of Assets and Liabilities - Estimated Fair Values of Money Market Funds, Short-Term and Long-Term Investments (Detail) (USD $) | Jun. 30, 2014 | Dec. 31, 2013
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Fair Value Disclosures [Abstract] |  |
One year or less | $ 43,582,785 |
One year to two years | 21,864,218 |
Two years to three years | 17,386,820 |
Three years to four years | 9,234,908 |
Four years to five years | 3,104,137 |
More than five years |  |
Estimated Fair Value | $ 95,172,868 | $ 75,354,552

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- Definition Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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