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Leases (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 25, 2020 USD ($)	Sep. 25, 2020 USD ($)
Lessee Lease Description [Line Items]
Weighted average remaining lease term	4 years 6 months	4 years 6 months
Weighted average discount rate	4.00%	4.00%
Operating lease payments	$ 0.0	$ 1.8
Lessee, operating lease not yet commenced description		As of September 25, 2020, the Company does not have any additional operating leases that have not yet commenced. The
Five Year Opt-Out Option for London Office Lease [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	3 years	3 years
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		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

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Description of lessee's operating lease that has not yet commenced. Including, but not limited to, nature of involvement with construction or design of underlying asset for lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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