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Commitments and Contingencies (Details) $ in Thousands, £ in Millions |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 20, 2017 GBP (£) ft² | Jul. 21, 2017 USD ($) ft² | May 08, 2017 USD ($) ft² | Apr. 21, 2017 USD ($) ft² | Jul. 11, 2016 USD ($) ft² item | May 20, 2016 GBP (£) ft² floor | Jul. 15, 2015 USD ($) ft² | Feb. 24, 2015 USD ($) ft² item | Feb. 24, 2014 USD ($) ft² item | Feb. 14, 2008 USD ($) ft² | Nov. 29, 1999 USD ($) ft² | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($)
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |  |  | $ 12,340 |  |
2019 |  |  |  |  |  |  |  |  |  |  |  | 13,652 |  |
2020 |  |  |  |  |  |  |  |  |  |  |  | 13,578 |  |
2021 |  |  |  |  |  |  |  |  |  |  |  | 13,432 |  |
2022 |  |  |  |  |  |  |  |  |  |  |  | 13,590 |  |
Thereafter |  |  |  |  |  |  |  |  |  |  |  | 67,136 |  |
Rental commitments |  |  |  |  |  |  |  |  |  |  |  | 133,728 |  |
Rent expense |  |  |  |  |  |  |  |  |  |  |  | 12,100 | $ 10,400 | $ 11,600
Secured by letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letters of credit |  |  |  |  |  |  |  |  |  |  |  | 3,600 |  |
Standby letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding under letters of credit |  |  |  |  |  |  |  |  |  |  |  | $ 3,600 |  |
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 | Secured by letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of the debt |  |  |  |  |  |  |  |  | $ 1,600 |  |  |  |  |
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 | Secured by letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of the debt |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |
New York, New York |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  |  |  |  |  |  | 25,261 |  |  |  |  |  |  |
Annual base rent |  |  |  | $ 1,200 |  |  | $ 1,800 |  |  |  |  |  |  |
Increase in annual base rent (as a percent) |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Additional lease area | ft² |  |  |  | 16,587 |  |  |  |  |  |  |  |  |  |
Number of years of annual base rent |  |  |  | 5 years |  |  | 5 years |  |  |  |  |  |  |
Rent abatement |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |
Tenant improvement allowance |  |  |  | 1,400 |  |  |  |  |  |  |  |  |  |
New York, New York | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |
New York, New York | Secured by letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of the debt |  |  |  | $ 1,300 |  |  |  |  |  |  |  |  |  |
Chicago, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  |  | 41,642 |  |  |  |  |  |  | 36,570 |  |  |  |
Lease extension term |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  | $ 1,100 |  |  |  |  |  |  | $ 1,000 |  |  |  |
Increase in annual base rent (as a percent) |  |  | 2.50% |  |  |  |  |  |  | 2.50% |  |  |  |
Rent abatement |  |  | $ 900 |  |  |  |  |  |  |  |  |  |  |
Tenant improvement allowance |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |
London, UK |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease area | ft² |  |  |  |  |  | 23,035 |  |  |  |  |  |  |  |
Number of floors available for lease | floor |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Annual base rent | £ | £ 0.5 |  |  |  |  | £ 1.6 |  |  |  |  |  |  |  |
Period after which lease rent will increase | 5 years |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Additional lease area | ft² | 7,700 |  |  |  |  |  |  |  |  |  |  |  |  |
San Francisco, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  | $ 900 |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual base rent (as a percent) |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Additional lease area | ft² |  | 9,206 |  |  |  |  |  |  |  |  |  |  |  |
Number of years of annual base rent |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Rent abatement |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Tenant improvement allowance |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |
San Francisco, CA | Secured by letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Rental Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of the debt |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |

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