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Investments in Debt Securities (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 24,851,145 | $ 20,745,938
Gross Unrealized Gain | 12,726 | 15,479
Gross Unrealized Loss | (2,931) | (1,367)
Fair Value | 24,860,940 | 20,760,050
Marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,739,066 | 10,835,995
Gross Unrealized Gain | 10,290 | 9,207
Gross Unrealized Loss | (2,866) | (7)
Fair Value | 20,746,490 | 10,845,195
Marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,567,499 | 2,000,897
Gross Unrealized Gain | 313 | 353
Gross Unrealized Loss | (335) | (7)
Fair Value | 1,567,477 | 2,001,243
Marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,171,567 | 8,835,098
Gross Unrealized Gain | 9,977 | 8,854
Gross Unrealized Loss | (2,531) |
Fair Value | 19,179,013 | 8,843,952
Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,112,079 | 9,909,943
Gross Unrealized Gain | 2,436 | 6,272
Gross Unrealized Loss | (65) | (1,360)
Fair Value | 4,114,450 | 9,914,855
Long-term marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,112,079 | 5,198,264
Gross Unrealized Gain | 2,436 | 2,747
Gross Unrealized Loss | (65) |
Fair Value | 4,114,450 | 5,201,011
Long-term marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 4,711,679
Gross Unrealized Gain |  | 3,525
Gross Unrealized Loss |  | (1,360)
Fair Value |  | $ 4,713,844

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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 accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale 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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- 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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