Investment Securities

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

At December 31, 2014, cash equivalents and marketable securities consisted of the following (in thousands):

	December 31, 2014
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Average Contractual Maturities
									(in days)
Money market funds	$	14,602	$	—	$	—	$	14,602	n/a
Common shares of CO2 Solutions	563		125		—		688		n/a
Total	$	15,165	$	125	$	—	$	15,290

The total cash and cash equivalents balance of $26.5 million as of December 31, 2014 was comprised of money market funds of $14.6 million and cash of $11.9 million held with major financial institutions worldwide. At December 31, 2014, the Company had no marketable securities in an unrealized loss position.

At December 31, 2013, cash equivalents, short-term investments 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	$	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

The total cash and cash equivalents balance of $22.1 million as of December 31, 2013 was comprised of money market funds of $16.1 million and cash of $6.0 million held with major financial institutions worldwide. At December 31, 2013, the Company had no marketable securities in an unrealized loss position.