At September 30, 2014, investment securities classified as available-for-sale equity securities and money market funds consisted of the following (in thousands):



	September 30, 2014
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Average Contractual Maturities
									(in days)
Money market funds (1)	$	14,600	$	—	$	—	$	14,600	n/a
Common shares of CO₂ Solutions (2)	563		468		—		1,031		n/a
Total	$	15,163	$	468	$	—	$	15,631

(1) Money market funds are classified in cash and cash equivalents on Codexis' condensed consolidated balance sheets.

(2) Common shares of CO₂ Solutions are classified in marketable securities on Codexis' condensed consolidated balance sheets.

At December 31, 2013, investment securities classified as available-for-sale equity securities and money market funds 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 (2)	563		232		—		795		n/a
Total	$	19,654	$	235	$	—	$	19,889

(1) Money market funds are classified in cash and cash equivalents on Codexis' condensed consolidated balance sheets.

(2) Common shares of CO₂ Solutions are classified in marketable securities on Codexis' condensed consolidated balance sheets.