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Contractual Maturities of Money Market Funds and Marketable Securities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Due in 1 year or less	$ 18,162,239
Due in 1 to 2 years	10,007,338
Amortized Cost	28,169,577	34,017,451
Due in 1 year or less	18,169,844
Due in 1 to 2 years	10,007,186
Fair Value	$ 28,177,030	$ 34,012,152

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Available for Sale Securities, Debt Maturities, after One Through Two Years, Fair Value

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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