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Investments (Tables)

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Summary of investments

		Contractual Maturity (in years)				As of June 30, 2012
						Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Market Value
Mutual funds			Less than 1			$	6,000,000			$	69,554			$	—			$	6,069,554
Certificates of deposit			Less than 1				5,460,000				38				(1,521	)			5,458,517
Municipal bonds			Less than 1				1,962,147				296				(3,452	)			1,958,991
Total						$	13,422,147			$	69,888			$	(4,973	)		$	13,487,062

		Contractual Maturity (in years)				As of December 31, 2011
						Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Market Value
Mutual funds			Less than 1			$	6,000,000			$	37,115			$	—			$	6,037,115
Certificates of deposit			Less than 1				5,771,000				—				(2,696	)			5,768,304
Municipal bonds			Less than 1				1,056,614				1,387				—				1,058,001
Total						$	12,827,614			$	38,502			$	(2,696	)		$	12,863,420

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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