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Investments in Money Market Funds and Marketable Securities (Detail) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 28,169,577 | $ 34,017,451
Gross Unrealized Gain | 15,090 | 4,637
Gross Unrealized Loss | (7,637) | (9,936)
Fair Value | 28,177,030 | 34,012,152
Marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,162,239 | 21,792,154
Gross Unrealized Gain | 10,362 | 4,071
Gross Unrealized Loss | (2,757) | (2,675)
Fair Value | 18,169,844 | 21,793,550
Marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,995,361 | 8,165,464
Gross Unrealized Gain | 3,344 | 435
Gross Unrealized Loss | (911) | (630)
Fair Value | 8,997,794 | 8,165,269
Marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,166,878 | 13,626,690
Gross Unrealized Gain | 7,018 | 3,636
Gross Unrealized Loss | (1,846) | (2,045)
Fair Value | 9,172,050 | 13,628,281
Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,007,338 | 12,225,297
Gross Unrealized Gain | 4,728 | 566
Gross Unrealized Loss | (4,880) | (7,261)
Fair Value | 10,007,186 | 12,218,602
Long-term marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,494,903 | 11,599,415
Gross Unrealized Gain | 4,660 | 466
Gross Unrealized Loss | (269) | (7,034)
Fair Value | 5,499,294 | 11,592,847
Long-term marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,512,435 | 625,882
Gross Unrealized Gain | 68 | 100
Gross Unrealized Loss | (4,611) | (227)
Fair Value | $ 4,507,892 | $ 625,755

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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