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Fair Value Measurement of Assets and Liabilities - Fair Value of Short and Long-Term Investments Classified as Available for Sale Securities (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 96,967,434 | $ 114,157,963
Gross Unrealized Gains | 36,990 | 1,236,697
Gross Unrealized Losses | (280,352) | (90,035)
Estimated Fair Value | 96,724,072 | 115,304,625
Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 27,716,592 | 23,030,970
Gross Unrealized Gains |  | 3,400
Gross Unrealized Losses | (4,583) | (1,013)
Estimated Fair Value | 27,712,009 | 23,033,357
Short-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 9,583,483 | 6,314,939
Gross Unrealized Gains | 857 | 1,032
Gross Unrealized Losses | (9,862) | (287)
Estimated Fair Value | 9,574,478 | 6,315,684
Long-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 84,812,054
Gross Unrealized Gains |  | 1,232,265
Gross Unrealized Losses |  | (88,735)
Estimated Fair Value |  | 85,955,584
Money Market Funds [Member] | Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 27,716,592 | 23,030,970
Gross Unrealized Gains | 0 | 3,400
Gross Unrealized Losses | (4,583) | (1,013)
Estimated Fair Value | 27,712,009 | 23,033,357
Corporate Debt Securities [Member] | Short-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 5,604,611 | 6,314,939
Gross Unrealized Gains |  | 1,032
Gross Unrealized Losses | (9,862) | (287)
Estimated Fair Value | 5,594,749 | 6,315,684
Corporate Debt Securities [Member] | Long-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 36,759,140 | 45,089,831
Gross Unrealized Gains | 8,196 | 630,807
Gross Unrealized Losses | (218,300) | (45,028)
Estimated Fair Value | 36,549,036 | 45,675,610
Sovereign Debt Securities [Member] | Short-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3,978,872 |
Gross Unrealized Gains | 857 |
Estimated Fair Value | 3,979,729 |
Sovereign Debt Securities [Member] | Long-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 22,908,219 | 21,153,227
Gross Unrealized Gains | 27,937 | 299,914
Gross Unrealized Losses | (47,607) |
Estimated Fair Value | 22,888,549 | 21,453,141
Asset Backed Securities [Member] | Long-Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 59,667,359 | 18,568,996
Gross Unrealized Gains | 36,133 | 301,544
Gross Unrealized Losses | (265,907) | (43,707)
Estimated Fair Value | $ 59,437,585 | $ 18,826,833

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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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