Investments

Investments consist of mutual funds, United States corporate debt securities, municipal bonds and an equity investment in the Company's affiliated entity PLS at September 30, 2015 and mutual funds and United States corporate debt securities at December 31, 2014. The Company classifies all investments as available-for-sale, as the sale of such investments may be required prior to maturity to implement management strategies. Available-for-sale securities are recorded at fair value, based on current market valuations. Unrealized gains and losses on available-for-sale securities are excluded from earnings and are reported as a separate component of other comprehensive income (loss) until realized. Realized gains and losses are included in non-operating other income (expense) on the condensed consolidated statement of operations and are derived using the specific identification method for determining the cost of the securities sold. During the three and nine months ended September 30, 2015 and 2014, a minimal amount of net realized loss on investments was recorded. Interest and dividends on investments classified as available-for-sale are included in interest and other income, net, in the condensed consolidated statements of operations. As of September 30, 2015, the Company had 56 available-for-sale securities in a gross unrealized loss position of which 6 were in such position for longer than 12 months. There were no impairments considered to be other-than-temporary as the Company has the ability and intent to hold the securities until recovery of the cost basis.

The following is a summary of available-for-sale securities as of September 30, 2015 and December 31, 2014:



		As of September 30, 2015
	Contractual Maturity (in years)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Mutual funds	---	$	58,633,654	$	—	$	(398,320	)	$	58,235,334
US corporate debt securities	Less than 2	26,993,900		6,052		(24,873		)	26,975,079
Municipal bonds	Less than 1	103,156		—		(13		)	103,143
Investment in affiliated entity (PLS)	---	—		7,130,768		—			7,130,768
Total investments		$	85,730,710	$	7,136,820	$	(423,206	)	$	92,444,324



		As of December 31, 2014
	Contractual Maturity (in years)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Mutual funds	---	$	29,487,758	$	2,667	$	(216,790	)	$	29,273,635
US corporate debt securities	Less than 2	23,839,606		70		(37,337		)	23,802,339
Total investments		$	53,327,364	$	2,737	$	(254,127	)	$	53,075,974