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Cash collateral pledged	12 Months Ended
Cash collateral pledged	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Cash collateral pledged	Cash Collateral Pledged As of December 31, 2014 and 2013, the Company pledged cash collateral in the amount of $8.3 million and $10.9 million, respectively, which relates to letters of credit issued to the landlords of the Company's premises in New York City, Boston and San Francisco (see Note 19).

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

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