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Lease Commitments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2021	Dec. 27, 2019	Dec. 28, 2018
Lessee Lease Description [Line Items]
Weighted average remaining lease term	1 year 7 months 6 days
Weighted average discount rate	4.00%
Operating lease payments	$ 2.6
Lease expense	$ 2.5	$ 2.8	$ 2.8
Lessee, operating lease not yet commenced description	As of January 1, 2021, the Company does not have any additional operating leases that have not yet commenced that create significant rights and obligations for the Company. In addition, in consideration of the COVID-19 pandemic and the changing nature of the Company’s use of office space for its workforce as part of the office lease analysis the Company conducted in 2020, the Company exercised its option to eliminate the remaining five years of the London lease. See Note 6 for further discussion.
Minimum [Member]
Lessee Lease Description [Line Items]
Operating leases terms	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating leases terms	4 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Amount of operating lease expense. Excludes sublease income.

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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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