Cash, Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments in Money Market Funds and Marketable Securities

Investments in money market funds and marketable securities consisted of the following at June 30, 2015:

	June 30, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Marketable securities:
U.S. Government and agency securities	$	12,092,702	$	4,006	$	(349	)	$	12,092,359
Corporate and other debt securities		11,060,445		1,394		(3,378	)		11,058,461
		23,153,147		5,400		(3,727	)		23,154,820
Long-term marketable securities:
U.S. Government and agency securities		1,223,276		272		(80	)		1,223,468
Corporate and other debt securities		—		—		—			—
		1,223,276		272		(80	)		1,223,468
Total	$	24,376,423	$	5,672	$	(3,807	)	$	24,378,288

Investments in money market funds and marketable securities consisted of the following at December 31, 2014:

	December 31, 2014
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Marketable securities:
U.S. Government and agency securities	$	12,716,167	$	2,174	$	(2,072	)	$	12,716,269
Corporate and other debt securities		10,373,332		4,229		(3,621	)		10,373,940
		23,089,499		6,403		(5,693	)		23,090,209
Long-term marketable securities:
U.S. Government and agency securities		1,227,843		—		(207	)		1,227,636
Corporate and other debt securities		2,326,066		—		(3,492	)		2,322,574
		3,553,909		—		(3,699	)		3,550,210
Total	$	26,643,408	$	6,403	$	(9,392	)	$	26,640,419

Contractual Maturities of Money Market Funds and Marketable Securities

The contractual maturities of money market funds and marketable securities at June 30, 2015 were as follows:

	Amortized Cost		Fair Value
Due in 1 year or less	$	23,153,147	$	23,154,820
Due in 1 to 2 years		1,223,276		1,223,468
	$	24,376,423	$	24,378,288