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Fair Value Measurement of Assets and Liabilities - Estimated Fair Values of Short-Term and Long-Term Investments (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value Disclosures [Abstract] |  |
One year or less | $ 37,286,487 |
One year to two years | 24,218,350 |
Two years to three years | 18,575,315 |
Three years to four years | 9,471,002 |
Four years to five years | 5,435,462 |
More than five years | 1,737,456 |
Estimated Fair Value | $ 96,724,072 | $ 115,304,625

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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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