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Leases - Summary of Operating and Financing Leases (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 25, 2020
Jun. 30, 2020
Lease cost    
Operating lease cost   $ 339
Financing lease cost   23
Sublease income   (98)
Total $ 0 264
Other information    
Operating cash flows out from operating leases   (339)
Operating cash flows in from operating leases   98
Operating cash flows out from financing leases   (22)
U.S. [Member]    
Lease cost    
Operating lease cost   236
Financing lease cost   23
Total   259
Other information    
Operating cash flows out from operating leases   (236)
Operating cash flows out from financing leases   $ (22)
Weighted average remaining lease term   8 months 12 days
Weighted average discount rate - operating leases   8.00%
Ireland [Member]    
Lease cost    
Operating lease cost   $ 103
Sublease income   (98)
Total   5
Other information    
Operating cash flows out from operating leases   (103)
Operating cash flows in from operating leases   $ 98
Weighted average remaining lease term   1 year 1 month 6 days
Weighted average discount rate - operating leases   8.00%