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Leases - Summary of Operating and Financing Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Lease Cost    
Operating lease cost $ 564  
Sublease income (132)  
Total 432  
Other information    
Operating cash flows out from operating leases (564)  
Operating cash flows in from operating leases 132  
Right-of-use assets exchanged for new operating lease liabilities 192 $ 729
U.S. [Member]    
Lease Cost    
Operating lease cost 417  
Total 417  
Other information    
Operating cash flows out from operating leases $ (417)  
Weighted average remaining lease term 1 year 2 months 12 days  
Weighted average discount rate - operating leases 8.00%  
Ireland [Member]    
Lease Cost    
Operating lease cost $ 147  
Sublease income (132)  
Total 15  
Other information    
Operating cash flows out from operating leases (147)  
Operating cash flows in from operating leases 132  
Right-of-use assets exchanged for new operating lease liabilities $ 192  
Weighted average remaining lease term 4 years 7 months 6 days  
Weighted average discount rate - operating leases 8.00%