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Leases - Summary of Operating and Financing Leases (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
Lease cost  
Operating lease cost $ 752
Financing lease cost 32
Sublease income (348)
Total 436
Other information  
Operating cash flows out from operating leases (794)
Operating cash flows in from operating leases 348
Operating cash flows from financing leases (35)
Right-of-use assets exchanged for new operating lease liabilities 874
U.S. [Member]  
Lease cost  
Operating lease cost 592
Financing lease cost 32
Sublease income (215)
Total 409
Other information  
Operating cash flows out from operating leases (634)
Operating cash flows in from operating leases 215
Operating cash flows from financing leases (35)
Right-of-use assets exchanged for new operating lease liabilities $ 874
Weighted average remaining lease term 1 year 4 months 24 days
Weighted average discount rate - operating leases 8.00%
Ireland [Member]  
Lease cost  
Operating lease cost $ 160
Sublease income (133)
Total 27
Other information  
Operating cash flows out from operating leases (160)
Operating cash flows in from operating leases $ 133
Weighted average remaining lease term 1 year 9 months 18 days
Weighted average discount rate - operating leases 8.00%