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Leases - Summary of Operating and Financing Leases (Details) - USD ($)
 12 Months Ended
Jun. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Lease Cost      
Operating lease cost   $ 699,000  
Financing lease cost   27,000  
Sublease income   (206,000)  
Total $ 0 520,000  
Other information      
Operating cash flows out from operating leases   (699,000)  
Operating cash flows in from operating leases   206,000  
Operating cash flows out from financing leases   (26,000)  
Right-of-use assets exchanged for new operating lease liabilities   729,000 $ 874,000
U.S. [Member]      
Lease Cost      
Operating lease cost   471,000  
Financing lease cost   27,000  
Total   498,000  
Other information      
Operating cash flows out from operating leases   (471,000)  
Operating cash flows out from financing leases   (26,000)  
Right-of-use assets exchanged for new operating lease liabilities   $ 729,000  
Weighted average remaining lease term   2 years 2 months 12 days  
Weighted average discount rate - operating leases   8.00%  
Ireland [Member]      
Lease Cost      
Operating lease cost   $ 228,000  
Sublease income   (206,000)  
Total   22,000  
Other information      
Operating cash flows out from operating leases   (228,000)  
Operating cash flows in from operating leases   $ 206,000  
Weighted average remaining lease term   7 months 6 days  
Weighted average discount rate - operating leases   8.00%