Cash and cash equivalents (Tables)

3 Months Ended

Mar. 31, 2013

Cash and cash equivalents

Schedule of cash and cash equivalents

	March 31, 2013		December 31, 2012
Cash and cash equivalents:
Cash	$	8,817	$	16,677
Money market accounts	37,831		39,001
Marketable securities	—		2,460
Total cash and cash equivalents	$	46,648	$	58,138