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Leases - Summary of Operating and Financing Leases (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Lease cost  
Operating lease cost $ 298
Financing lease cost 8
Sublease income (154)
Total 152
Other information  
Operating cash flows out from operating leases (318)
Operating cash flows in from operating leases 154
Operating cash flows from financing leases (12)
Right-of-use assets exchanged for new operating lease liabilities 874
U.S. [Member]  
Lease cost  
Operating lease cost 242
Financing lease cost 8
Sublease income (107)
Total 143
Other information  
Operating cash flows out from operating leases (262)
Operating cash flows in from operating leases 107
Operating cash flows from financing leases (12)
Right-of-use assets exchanged for new operating lease liabilities $ 874
Weighted average remaining lease term 1 year 10 months 24 days
Weighted average discount rate - operating leases 8.00%
Ireland [Member]  
Lease cost  
Operating lease cost $ 56
Sublease income (47)
Total 9
Other information  
Operating cash flows out from operating leases (56)
Operating cash flows in from operating leases $ 47
Weighted average remaining lease term 2 years 4 months 24 days
Weighted average discount rate - operating leases 8.00%