Cash, Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2013

Investments in debt securities consisted of the following at June 30, 2013:


	June 30, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Marketable securities:
U.S. Government and agency securities	$	1,539,779	$	111	$	(37	)	$	1,539,853
Corporate and other debt securities		19,265,821		11,851		(3,692	)		19,273,980

		20,805,600		11,962		(3,729	)		20,813,833
Long-term marketable securities:
U.S. Government and agency securities		4,037,566		854		(1,186	)		4,037,234
Corporate and other debt securities		608,447		49		(442	)		608,054

		4,646,013		903		(1,628	)		4,645,288

Total	$	25,451,613	$	12,865	$	(5,357	)	$	25,459,121

Investments in debt securities consisted of the following at December 31, 2012:


	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Marketable securities:
U.S. Government and agency securities	$	2,000,897	$	353	$	(7	)	$	2,001,243
Corporate and other debt securities		8,835,098		8,854		—			8,843,952

		10,835,995		9,207		(7	)		10,845,195
Long-term marketable securities:
U.S. Government and agency securities		5,198,264		2,747		—			5,201,011
Corporate and other debt securities		4,711,679		3,525		(1,360	)		4,713,844

		9,909,943		6,272		(1,360	)		9,914,855

Total	$	20,745,938	$	15,479	$	(1,367	)	$	20,760,050

Contractual Maturities of Debt Securities

The contractual maturities of debt securities at June 30, 2013 were as follows:


	Amortized Cost		Fair Value
Due in 1 year or less	$	20,805,600	$	20,813,833
Due in 1 to 2 years		4,646,013		4,645,288

	$	25,451,613	$	25,459,121

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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