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Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) | Jun. 30, 2014 | Dec. 31, 2013
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Assets |  |
Total Financial Assets | $ 95,172,868 | $ 75,354,552
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Total Financial Assets | 89,397,443 | 69,225,356
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Total Financial Assets | 5,775,425 | 6,129,196
Money Market Funds [Member] |  |
Assets |  |
Cash and Cash Equivalents | 38,994,495 | 19,630,109
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Cash and Cash Equivalents | 38,994,495 | 19,630,109
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Cash and Cash Equivalents |  |
Corporate Debt Securities [Member] |  |
Assets |  |
Cash and Cash Equivalents | 24,607 | 88,648
Investments | 21,899,049 | 25,239,905
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Cash and Cash Equivalents | 24,607 | 88,648
Investments | 16,123,624 | 19,110,709
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Cash and Cash Equivalents |  |
Investments | 5,775,425 | 6,129,196
Sovereign Debt Securities [Member] |  |
Assets |  |
Investments | 34,254,717 | 30,395,890
Sovereign Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets |  |
Investments | 34,254,717 | 30,395,890
Sovereign Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets |  |
Investments |  |

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- Definition Total financial assets. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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