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Leases - Summary of Operating and Financing Leases (Details) - USD ($)
 9 Months Ended
Jun. 25, 2020
Sep. 30, 2020
Sep. 30, 2019
Lease cost      
Operating lease cost   $ 509,000  
Financing lease cost   27,000  
Sublease income   (162,000)  
Total $ 0 374,000  
Other information      
Operating cash flows out from operating leases   (509,000)  
Operating cash flows in from operating leases   162,000  
Operating cash flows out from financing leases   (26,000)  
Right of use assets obtained in exchange for lease obligations   729,000 $ 874,000
U.S. [Member]      
Lease cost      
Operating lease cost   353,000  
Financing lease cost   27,000  
Total   380,000  
Other information      
Operating cash flows out from operating leases   (353,000)  
Operating cash flows out from financing leases   $ (26,000)  
Weighted average remaining lease term   2 years 4 months 24 days  
Weighted average discount rate - operating leases   8.00%  
Right of use assets obtained in exchange for lease obligations   $ 729,000  
Ireland [Member]      
Lease cost      
Operating lease cost   156,000  
Sublease income   (162,000)  
Total   (6,000)  
Other information      
Operating cash flows out from operating leases   (156,000)  
Operating cash flows in from operating leases   $ 162,000  
Weighted average remaining lease term   9 months 18 days  
Weighted average discount rate - operating leases   8.00%