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Leases (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 29, 2019
USD ($)
Lessee Lease Description [Line Items]  
Weighted average remaining lease term 5 years 4 months 24 days
Weighted average discount rate 4.00%
Operating lease payments $ 0.7
Lessee, operating lease not yet commenced description As of March 29, 2019, the Company does not have any additional operating leases that have not yet commenced.
Excluding Five-Year Option Out Period for London Office Lease [Member]  
Lessee Lease Description [Line Items]  
Weighted average remaining lease term 3 years 4 months 24 days
London Office Lease [Member]  
Lessee Lease Description [Line Items]  
Operating lease option out period 5 years
Minimum [Member]  
Lessee Lease Description [Line Items]  
Operating leases terms 1 year
Maximum [Member]  
Lessee Lease Description [Line Items]  
Operating leases terms 10 years