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Cash Collateral Pledged	9 Months Ended
Cash Collateral Pledged	Sep. 30, 2018
Cash and Cash Equivalents [Abstract]
Cash Collateral Pledged	Cash Collateral Pledged As of September 30, 2018 and December 31, 2017, the Company pledged cash collateral in the amount of $5.3 million and $6.1 million, respectively, which relates to letters of credit issued to the landlords of the Company's premises in New York City, Boston, Stamford and San Francisco. The Company also has pledged collateral for reinsurance agreements which amounted to $10.8 million, as of September 30, 2018, and $11.8 million, as of December 31, 2017, which is anticipated to be due March 2021 (see Note 17).