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Contractual Maturities of Money Market Funds and Marketable Securities (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Due in 1 year or less	$ 23,153,147
Due in 1 to 2 years	1,223,276
Amortized Cost	24,376,423	$ 26,643,408
Due in 1 year or less	23,154,820
Due in 1 to 2 years	1,223,468
Fair Value	$ 24,378,288	$ 26,640,419

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- Definition

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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