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Cash collateral pledged	3 Months Ended
Cash collateral pledged	Mar. 31, 2012
Cash Collateral Pledged
Cash collateral pledged	Cash collateral pledged As of March 31, 2012 and December 31, 2011, cash collateral pledged in the amount of $9.7 million and $9.8 million, respectively, primarily relates to (a) a bond held as collateral on a letter of credit and (b) letters of credit issued to the landlord of the Company's premises in New York City (see Note 13). Also included in cash collateral pledged as of March 31, 2012 and December 31, 2011 is $0.5 million, respectively, relating to an agreement that the Company has with Société Générale to cover the costs of litigation matters included in the agreement.