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Leases - Summary of Operating and Financing Leases (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Lease Cost  
Operating lease cost $ 170
Financing lease cost 12
Sublease income (43)
Total 139
Other information  
Operating cash flows out from operating leases (170)
Operating cash flows in from operating leases 43
Operating cash flows out from financing leases (11)
U.S. [Member]  
Lease Cost  
Operating lease cost 118
Financing lease cost 12
Total 130
Other information  
Operating cash flows out from operating leases (118)
Operating cash flows out from financing leases $ (11)
Weighted average remaining lease term 10 months 24 days
Weighted average discount rate - operating leases 8.00%
Ireland [Member]  
Lease Cost  
Operating lease cost $ 52
Sublease income (43)
Total 9
Other information  
Operating cash flows out from operating leases (52)
Operating cash flows in from operating leases $ 43
Weighted average remaining lease term 1 year 3 months 18 days
Weighted average discount rate - operating leases 8.00%