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Leases - Summary of Operating and Financing Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lease Cost    
Operating lease cost $ 920  
Financing lease cost 42  
Sublease income (390)  
Total 572  
Other information    
Operating cash flows out from operating leases (965)  
Operating cash flows in from operating leases 390  
Operating cash flows out from financing leases (39)  
Right-of-use assets exchanged for new operating lease liabilities 874 $ 0
U.S. [Member]    
Lease Cost    
Operating lease cost 710  
Financing lease cost 42  
Sublease income (215)  
Total 537  
Other information    
Operating cash flows out from operating leases (755)  
Operating cash flows in from operating leases 215  
Operating cash flows out from financing leases (39)  
Right-of-use assets exchanged for new operating lease liabilities $ 874  
Weighted average remaining lease term 1 year 1 month 6 days  
Weighted average discount rate - operating leases 8.00%  
Ireland [Member]    
Lease Cost    
Operating lease cost $ 210  
Sublease income (175)  
Total 35  
Other information    
Operating cash flows out from operating leases (210)  
Operating cash flows in from operating leases $ 175  
Weighted average remaining lease term 1 year 9 months 18 days  
Weighted average discount rate - operating leases 8.00%