4. Cash and cash equivalents and marketable securities

Cash and cash equivalents, and marketable securities consisted of the following:

	December 31,

	2012		2011
Cash and cash equivalents:
Cash	$	16,677	$	12,851
Money market accounts		39,001		81,082
Marketable securities		2,460		—

Total cash and cash equivalents	$	58,138	$	93,933

Short-term marketable securities—available-for-sale:
Marketable securities	$	41,558	$	—

Total short-term marketable securities	$	41,558	$	—

All contractual maturities of marketable securities were less than one year at December 31, 2012. These consist primarily of corporate securities which include commercial paper and corporate debt instruments including notes issued by foreign or domestic corporations which pay in U.S. dollars and carry a rating of A or better.

For the years ended December 31, 2012, 2011 and 2010, interest income was $183, $37 and $31, respectively, which is included in interest and other income (expense), net in the accompanying consolidated statements of operations.