Cash Equivalents and Marketable Securities

At June 30, 2014, cash equivalents and marketable securities consisted of the following (in thousands):



	June 30, 2014
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Average Contractual Maturities
									(in days)
Money market funds (1)	$	15,598	$	—	$	—	$	15,598	n/a
Common shares of CO2 Solutions	563		890		—		1,453		n/a
Total	$	16,161	$	890	$	—	$	17,051

(1) Money market funds are classified in cash and cash equivalents on the Company’s condensed consolidated balance sheets.

At December 31, 2013, cash equivalents and marketable securities consisted of the following (in thousands):



	December 31, 2013
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Average Contractual Maturities
									(in days)
Money market funds (1)	$	16,089	$	—	$	—	$	16,089	n/a
Corporate bonds	1,002		3		—		1,005		140
U.S. Treasury obligations	2,000		—		—		2,000		59
Common shares of CO2 Solutions	563		232		—		795		n/a
Total	$	19,654	$	235	$	—	$	19,889

(1) Money market funds are classified in cash and cash equivalents on the Company’s condensed consolidated balance sheets.