Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Available for Sale Securities Held in Investment Portfolio

The following table summarizes the fair value of our cash, cash equivalents and available-for-sale marketable securities held in our current investment portfolio:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
June 30, 2013
Cash	$	251,069	$	—	$	—		$	251,069
Cash equivalents		22,501,826		—		—			22,501,826
Marketable debt securities, current		1,425,636		425		—			1,426,061

Total cash, cash equivalents, and marketable securities	$	24,178,531	$	425	$	—		$	24,178,956

December 31, 2012
Cash	$	254,268	$	—	$	—		$	254,268
Cash equivalents		8,217,259		—		(252	)		8,217,007
Marketable debt securities, current		13,901,782		—		(1,104	)		13,900,678

Total cash, cash equivalents, and marketable securities	$	22,373,309	$	—	$	(1,356	)	$	22,371,953

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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