Leases (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 26, 2020 USD ($)	Jun. 26, 2020 USD ($)
Lessee Lease Description [Line Items]
Weighted average remaining lease term	4 years 7 months 6 days	4 years 7 months 6 days
Weighted average discount rate	4.00%	4.00%
Operating lease payments	$ 0.6	$ 1.2
Lessee, operating lease not yet commenced description		As of June 26, 2020, the Company does not have any additional operating leases that have not yet commenced
Five Year Opt-Out Option for London Office Lease [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	3 years 2 months 12 days	3 years 2 months 12 days
London Office Lease [Member]
Lessee Lease Description [Line Items]
Operating lease opt-out option	5 years	5 years
Miami Office Lease [Member]
Lessee Lease Description [Line Items]
Operating lease opt-out option	4 years	4 years
Lessee, operating lease, option to extend		the Company did extend its Miami office lease effective July 1, 2020, for an additional four 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