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Leases - Summary of Operating and Financing Leases (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
Lease cost  
Operating lease cost $ 587
Financing lease cost 19
Sublease income (308)
Total 298
Other information  
Operating cash flows out from operating leases (628)
Operating cash flows in from operating leases 308
Operating cash flows from financing leases (24)
Right-of-use assets exchanged for new operating lease liabilities 874
U.S. [Member]  
Lease cost  
Operating lease cost 475
Financing lease cost 19
Sublease income (215)
Total 279
Other information  
Operating cash flows out from operating leases (516)
Operating cash flows in from operating leases 215
Operating cash flows from financing leases (24)
Right-of-use assets exchanged for new operating lease liabilities $ 874
Weighted average remaining lease term 1 year 8 months 12 days
Weighted average discount rate - operating leases 8.00%
Ireland [Member]  
Lease cost  
Operating lease cost $ 112
Sublease income (93)
Total 19
Other information  
Operating cash flows out from operating leases (112)
Operating cash flows in from operating leases $ 93
Weighted average remaining lease term 2 years 1 month 6 days
Weighted average discount rate - operating leases 8.00%