7.	Cash, Cash Equivalents and Marketable Securities

At June 30, 2015 and December 31, 2014, the Company’s investments included money market funds as well as short-term and long-term marketable securities. These marketable securities are classified as available-for-sale. Marketable securities are investments with original maturities of greater than 90 days. Long-term marketable securities are securities with maturities of greater than one year. The average remaining contractual maturity of marketable securities at June 30, 2015 is approximately 5.75 months.

Management reviewed the Company’s investments as of June 30, 2015 and December 31, 2014 and concluded that there are no securities with other than temporary impairments in its investment portfolio. The Company does not intend to sell any investments in an unrealized loss position, and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases.

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

At June 30, 2015, the Company’s investments included twenty-six securities in unrealized loss positions with a total unrealized loss of approximately $4,000 and a total fair market value of approximately $10,144,000. All investments with gross unrealized losses have been in unrealized loss positions for less than 12 months. The unrealized losses were caused primarily by current economic and market conditions. There was no change in the credit risk of the securities. There were no realized gains or losses on the investments for the six months ended June 30, 2015 or the six months ended June 30, 2014.

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

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