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Cash collateral pledged
9 Months Ended
Sep. 30, 2012
Cash and Cash Equivalents [Abstract]  
Cash collateral pledged
Cash collateral pledged
As of September 30, 2012 and December 31, 2011, cash collateral pledged in the amount of $9.3 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 14).