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Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2018
Commitments and Contingencies [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies Operating Lease On April 5, 2018, we entered into an operating lease agreement with MEPT Seaport 13 Stillings LLC, or MEPT, for 30,175 square feet of office space located in Boston, Massachusetts for our new corporate headquarters. The anticipated commencement date of the lease is August 15, 2018. The initial term of the lease is 123 months with one five-year renewal option. Future minimum annual lease payments under this lease are $0.8 million in 2018, $2.2 million in 2019, $2.3 million in 2020, $2.3 million in 2021, $2.3 million in 2022, and $14.2 million thereafter. MEPT will provide us with a three-month free rent period and a tenant improvement allowance up to $3.8 million. We provided MEPT with a letter of credit to secure our obligations under the lease in the initial amount of $2.4 million, to be reduced to $1.8 million on the third anniversary of the rent commencement date and to $1.2 million on the fifth anniversary of the rent commencement date if we meet certain conditions set forth in the lease at each such time. This balance is included in deposits and other assets on the accompanying condensed consolidated balance sheets.