5. Cash, Cash Equivalents and Investments

As of December 31, 2015 and 2014, we had invested our excess cash balances primarily in money market funds and a corporate equity security. Our securities are classified as available-for-sale and are carried at estimated fair value, with unrealized gains and losses reported in "Accumulated other comprehensive income (loss)" in stockholders’ equity, net of estimated taxes. See Note 4 for fair value measurement information. The cost of securities sold is based on the specific identification method. To date, we have not experienced credit losses on investments in these instruments and we do not require collateral for our investment activities.



Summary of Cash and Available-For-Sale Securities	Adjusted Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Short-Term Investments
(In thousands)
December 31, 2015
Cash	$	124,082	$	—	$	—	$	124,082	$	124,082	$	—
Money market funds	94,801		—		—		94,801		94,801		—
Corporate securities	799		670		—		1,469		—		1,469
Total	$	219,682	$	670	$	—	$	220,352	$	218,883	$	1,469

December 31, 2014
Cash	$	69,585	$	—	$	—	$	69,585	$	69,585	$	—
Money market funds	221,792		—		—		221,792		221,792		—
Corporate securities	1,750		560		—		2,310		—		2,310
Total	$	293,127	$	560	$	—	$	293,687	$	291,377	$	2,310

We recognized approximately $997,000, $30,000 and zero, respectively, of gains on sales of available-for-sale securities in the years ended December 31, 2015, 2014 and 2013.

The unrealized gain on investments included in "Other comprehensive income (loss), net of tax," was approximately $435,000 and $364,000 as of December 31, 2015 and 2014, respectively.