5. Cash, cash equivalents and short-term investments

The following tables summarize our cash, cash equivalents and marketable securities at March 31, 2014 and December 31, 2013 (in thousands):

March 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and money market funds	$	56,134	$	—	$	—		$	56,134
Corporate debt securities
Due in one year or less	26,058		9		(8		)	26,059
Due in two years or less	7,273		—		(4		)	7,269
Total	$	89,465	$	9	$	(12	)	$	89,462
Reported as:
Cash and cash equivalents	$	56,134	$	—	$	—		$	56,134
Short-term investments	33,331		9		(12		)	33,328
Total	$	89,465	$	9	$	(12	)	$	89,462

December 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and money market funds	$	18,078	$	—	$	—		$	18,078
Corporate debt securities
Due in one year or less	22,631		11		(2		)	22,640
Due in two years or less	3,708		2		(1		)	3,709
Total	$	44,417	$	13	$	(3	)	$	44,427
Reported as:
Cash and cash equivalents	$	18,078	$	—	$	—		$	18,078
Short-term investments	26,339		13		(3		)	26,349
Total	$	44,417	$	13	$	(3	)	$	44,427

At March 31, 2014 and December 31, 2013 we held ten and eight debt securities that had been in an unrealized loss position for less than 12 months, respectively. We held no investments that had been in a continuous unrealized loss position for 12 months or longer. The aggregate fair value of these securities was $13.9 million and $9.5 million at March 31, 2014 and December 31, 2013, respectively. We evaluated our securities for other-than-temporary impairments based on quantitative and qualitative factors, and we considered the decline in market value for the ten debt securities as of March 31, 2014 to be primarily attributable to current economic and market conditions. We will likely not be required to sell these securities, but we do not intend to sell these securities before the recovery of their amortized cost bases, which recovery is expected within the next 12 months. Based on our analysis, we do not consider these investments to be other-than-temporarily impaired as of March 31, 2014.

As of March 31, 2014, we held $9.3 million in financial institution debt securities and other corporate debt securities located in Canada, the United Kingdom, Australia, and France. As of December 31, 2013, we held $11.7 million in financial institution debt securities and other corporate debt securities located in Canada, the United Kingdom, the Netherlands, Australia, and Norway. Based on our analysis, we do not consider these investments to be other-than-temporarily impaired as of March 31, 2014.

We had immaterial realized gains and no losses or other-than-temporary impairments on our short-term investments for the three months ended March 31, 2014 and the period from April 5, 2011 (inception) through March 31, 2014 and no realized gains or losses or other-than-temporary impairments for the three months ended March 31, 2013.