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Commitments and Contingencies (Details) $ in Thousands, £ in Millions |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 11, 2016 USD ($) ft² item | May 20, 2016 GBP (£) ft² floor | Jul. 15, 2015 USD ($) ft² item | Feb. 24, 2015 USD ($) ft² item | Feb. 24, 2014 USD ($) ft² item | Feb. 14, 2008 USD ($) ft² | Nov. 29, 1999 USD ($) ft² | Dec. 31, 2016 USD ($) | Jan. 02, 2016 GBP (£) | Jan. 02, 2016 USD ($) | Jan. 03, 2015 USD ($) | Oct. 26, 2006 ft²
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  | $ 9,078 |  |  |  |
2018 |  |  |  |  |  |  |  | 9,302 |  |  |  |
2019 |  |  |  |  |  |  |  | 9,477 |  |  |  |
2020 |  |  |  |  |  |  |  | 9,198 |  |  |  |
2021 |  |  |  |  |  |  |  | 9,034 |  |  |  |
Thereafter |  |  |  |  |  |  |  | 50,842 |  |  |  |
Rental commitments |  |  |  |  |  |  |  | 96,931 |  |  |  |
Rent expense |  |  |  |  |  |  |  | 10,400 |  | $ 11,600 | $ 10,000 |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Contingent acquisition liability |  |  |  |  |  |  |  | 500 |  | $ 800 |  |
Standby letters of credit |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letters of credit |  |  |  |  |  |  |  | $ 2,200 |  |  |  |
Boston, Massachusetts |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  |  |  | 67,659 | 57,602 |  |  |  |  |  |  |
Number of times, lease can be renewed | item |  |  |  | 1 | 2 |  |  |  |  |  |  |
Lease extension term |  |  |  | 3 years | 5 years |  |  |  |  |  |  |
Annual base rent |  |  |  |  | $ 2,400 |  |  |  |  |  |  |
Increase in annual base rent (as a percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |
Additional lease area | ft² |  |  |  | 10,057 |  |  |  |  |  |  |  |
Annual fixed rent |  |  |  | $ 500 |  |  |  |  |  |  |  |
Rent abatement |  |  |  |  | $ 1,200 |  |  |  |  |  |  |
Tenant improvement allowance |  |  |  |  | 4,800 |  |  |  |  |  |  |
Boston, Massachusetts | Letters of credit |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letters of credit |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Washington, D.C |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Number of amendments | item | 6 |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² | 6,366 |  |  |  |  |  | 44,932 |  |  |  |  |
Annual base rent | $ 300 |  |  |  |  |  | $ 1,400 |  |  |  |  |
Increase in annual base rent (as a percent) | 2.25% |  |  |  |  |  | 2.00% |  |  |  |  |
Rent abatement | $ 200 |  |  |  |  |  |  |  |  |  |  |
Tenant improvement allowance | 500 |  |  |  |  |  |  |  |  |  |  |
Washington, D.C | Letters of credit |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letters of credit | $ 200 |  |  |  |  |  |  |  |  |  |  |
New York, New York |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  |  | 25,261 |  |  |  |  |  |  |  |  |
Number of times, lease can be renewed | item |  |  | 1 |  |  |  |  |  |  |  |  |
Lease extension term |  |  | 5 years |  |  |  |  |  |  |  |  |
Annual base rent |  |  | $ 1,800 |  |  |  |  |  |  |  |  |
Number of years of annual base rent |  |  | 5 years |  |  |  |  |  |  |  |  |
Increase in annual base rent |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Rent abatement period |  |  | 10 months |  |  |  |  |  |  |  |  |
Rent abatement |  |  | $ 1,500 |  |  |  |  |  |  |  |  |
Tenant improvement allowance |  |  | 2,100 |  |  |  |  |  |  |  |  |
New York, New York | Letters of credit |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letters of credit |  |  | $ 900 |  |  |  |  |  |  |  |  |
Chicago, Illinois |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  |  |  |  |  | 36,570 |  |  |  |  |  |
Annual base rent |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Increase in annual base rent (as a percent) |  |  |  |  |  | 2.50% |  |  |  |  |  |
Rent abatement period |  |  |  |  |  | 8 months |  |  |  |  |  |
Rent abatement |  |  |  |  |  | $ 600 |  |  |  |  |  |
Tenant improvement allowance |  |  |  |  |  | $ 2,400 |  |  |  |  |  |
London, UK |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  | 23,035 |  |  |  |  |  |  |  |  |  | 32,168
Number of floors available for lease | floor |  | 2 |  |  |  |  |  |  |  |  |  |
Annual base rent | £ |  | £ 1.6 |  |  |  |  |  |  | £ 1.2 |  |  |
Period after which lease rent will increase |  | 5 years |  |  |  |  |  |  |  |  |  |

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