Marketable Securities

9 Months Ended

Sep. 30, 2011

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

(5) Marketable Securities

The Company’s marketable securities consist of available-for-sale securities, which are carried at fair value, with unrealized gains and losses reported as a separate component of stockholders’ equity. Unrealized gains and losses are computed on the specific identification method. Realized gains, realized losses and declines in value judged to be other-than-temporary, are included in interest and other income, net. The cost of available-for-sale securities sold is based on the specific identification method and interest earned is included in interest and other income.

The cost and fair values of the Company’s available-for-sale marketable securities as of September 30, 2011, are as follows:

	Aggregate		Cost or Amortized		Net Unrealized
	Fair Value		Cost		Gains / (loss)
Auction rate securities	$	619,834	$	700,000	$	(80,166	)
Government securities		17,125,130		17,108,928		16,202
Corporate debt securities		3,105,693		3,118,322		(12,629	)
	$	20,850,657	$	20,927,250	$	(76,593	)

The cost and fair values of the Company’s available-for-sale marketable securities as of December 31, 2010, are as follows:

	Aggregate		Cost or Amortized		Net Unrealized
	Fair Value		Cost		Gains / (loss)
Auction rate securities	$	578,643	$	700,000	$	(121,357	)
Government securities		17,053,041		17,043,856		9,185
Corporate debt securities		1,850,594		1,842,413		8,181
	$	19,482,278	$	19,586,269	$	(103,991	)