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Leases - Summary of Operating and Financing Leases (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Lease cost    
Operating lease cost $ 451  
Sublease income (132)  
Total 319  
Other information    
Operating cash flows out from operating leases (451)  
Operating cash flows in from operating leases 132  
Right of use assets obtained in exchange for lease obligations 192 $ 729
U.S. [Member]    
Lease cost    
Operating lease cost 315  
Total 315  
Other information    
Operating cash flows out from operating leases $ (315)  
Weighted average remaining lease term 1 year 3 months 18 days  
Weighted average discount rate - operating leases 8.00%  
Ireland [Member]    
Lease cost    
Operating lease cost $ 136  
Sublease income (132)  
Total 4  
Other information    
Operating cash flows out from operating leases (136)  
Operating cash flows in from operating leases 132  
Right of use assets obtained in exchange for lease obligations $ 192  
Weighted average remaining lease term 4 years 9 months 18 days  
Weighted average discount rate - operating leases 8.00%