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Financial Instruments - Available for Sale Securities Held in Investment Portfolio (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 24,178,531 | $ 22,373,309
Gross Unrealized Gains | 425 |
Gross Unrealized (Losses) |  | (1,356)
Fair Value | 24,178,956 | 22,371,953
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 251,069 | 254,268
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Fair Value | 251,069 | 254,268
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,501,826 | 8,217,259
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  | (252)
Fair Value | 22,501,826 | 8,217,007
Marketable debt securities, current [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,425,636 | 13,901,782
Gross Unrealized Gains | 425 |
Gross Unrealized (Losses) |  | (1,104)
Fair Value | $ 1,426,061 | $ 13,900,678

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale 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 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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