Short-Term Marketable Securities

12 Months Ended

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Short-Term Marketable Securities

2. Short-Term Marketable Securities

The following is a summary of short-term marketable securities classified as available-for-sale (in thousands):

December 31, 2015	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	7,027	$	—	$	8	$	7,019
Corporate bonds		1,000		—		—		1,000
Certificates of deposit		15,239		—		—		15,239
	$	23,266	$	—	$	8	$	23,258

December 31, 2014	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	5,558	$	—	$	1	$	5,557
Government-sponsored enterprise securities		7,499		—		6		7,493
Corporate bonds		2,025		—		5		2,020
Certificates of deposit		8,429		—		—		8,429
	$	23,511	$	—	$	12	$	23,499

At December 31, 2015, none of these securities were scheduled to mature outside of one year. There were no net realized gains (losses) on sales of available-for-sale securities for the years ended December 31, 2015, 2014 and 2013. None of these investments have been in a continuous unrealized loss position for more than 12 months as of December 31, 2015 and 2014.