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Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Fair Value Measurements Of Financial Instruments [Line Items]
Short-term investments	$ 61,725,464	$ 87,379,121
Proceeds from sales of available-for-sale	141,200,000
Net impact of sale of investments	518,713
Reclassification of other comprehensive income to net income	871,702
Auction Rate Securities [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Investments	0	0
Collateralized Debt Obligations [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Investments	0	0
Structured Investment Vehicles [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Investments	$ 0	$ 0

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Other Comprehensive Income Loss Reclassification Adjustment For Available For Sale Securities Included In Net Income Net Of Tax

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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