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Leases (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 27, 2019
USD ($)
Sep. 27, 2019
USD ($)
Lessee Lease Description [Line Items]    
Weighted average remaining lease term 5 years 1 month 6 days 5 years 1 month 6 days
Weighted average discount rate 4.00% 4.00%
Operating lease payments $ 0.7 $ 2.0
Lessee, operating lease not yet commenced description   As of September 27, 2019, the Company does not have any additional operating leases that have not yet commenced that create significant rights and obligations for the Company.
Five Year Opt-Out Option for London Office Lease [Member]    
Lessee Lease Description [Line Items]    
Weighted average remaining lease term 3 years 3 months 18 days 3 years 3 months 18 days
London Office Lease [Member]    
Lessee Lease Description [Line Items]    
Operating lease opt-out option 5 years 5 years
Minimum [Member]    
Lessee Lease Description [Line Items]    
Operating leases terms 1 year 1 year
Maximum [Member]    
Lessee Lease Description [Line Items]    
Operating leases terms 10 years 10 years