Cash and Cash Equivalents and Investments

9 Months Ended

Sep. 30, 2014

Cash and Cash Equivalents and Investments [Abstract]

Cash and Cash Equivalents Disclosure

Cash and Cash Equivalents and Investments

The fair value of cash and cash equivalents and investments held at September 30, 2014 and December 31, 2013 are as follows:

	As of September 30, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	26,775	$	—	$	—		$	26,775
Securities maturing within one year:
Certificates of deposit	552		—		—			552
U.S. treasury securities	30,540		2		—			30,542
Total short-term investments	$	31,092	$	2	$	—		$	31,094
Total cash and cash equivalents and investments	$	57,867	$	2	$	—		$	57,869
	As of December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
			(in thousands)
Cash and cash equivalents	$	37,499	$	—	$	—		$	37,499
Securities maturing within one year:
Certificates of deposit	552		—		—			552
U.S. treasury securities	91,075		3		(1		)	91,077
Total short-term investments	$	91,627	$	3	$	(1	)	$	91,629
Total cash and cash equivalents and investments	$	129,126	$	3	$	(1	)	$	129,128

There were no realized gains or losses for the nine months ended September 30, 2014, and no realized gains or losses for the nine months ended September 30, 2013. The cost of securities sold is based on the specific identification method.