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Investments in Money Market Funds and Marketable Securities (Detail) (USD $) | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 28,162,159 | $ 34,017,451
Gross Unrealized Gain | 9,264 | 4,637
Gross Unrealized Loss | (3,957) | (9,936)
Fair Value | 28,167,466 | 34,012,152
Marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,267,093 | 21,792,154
Gross Unrealized Gain | 4,273 | 4,071
Gross Unrealized Loss | (849) | (2,675)
Fair Value | 16,270,517 | 21,793,550
Marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,286,273 | 8,165,464
Gross Unrealized Gain | 2,220 | 435
Gross Unrealized Loss | (119) | (630)
Fair Value | 7,288,374 | 8,165,269
Marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,980,820 | 13,626,690
Gross Unrealized Gain | 2,053 | 3,636
Gross Unrealized Loss | (730) | (2,045)
Fair Value | 8,982,143 | 13,628,281
Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,895,066 | 12,225,297
Gross Unrealized Gain | 4,991 | 566
Gross Unrealized Loss | (3,108) | (7,261)
Fair Value | 11,896,949 | 12,218,602
Long-term marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,365,077 | 11,599,415
Gross Unrealized Gain | 3,144 | 466
Gross Unrealized Loss | (888) | (7,034)
Fair Value | 7,367,333 | 11,592,847
Long-term marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,529,989 | 625,882
Gross Unrealized Gain | 1,847 | 100
Gross Unrealized Loss | (2,220) | (227)
Fair Value | $ 4,529,616 | $ 625,755

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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