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Commitments and Contingencies - Operating Leases (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Leases      
Operating lease liabilities $ 1,792   $ 1,792
Operating lease expense $ 400   $ 1,100
King of Prussia      
Leases      
Weighted-average remaining lease term of operating leases 4 years 2 months 12 days   4 years 2 months 12 days
Weighted-average discount rate (as a percent) 9.80%   9.80%
Lease Agreement | King of Prussia, Pennsylvania      
Leases      
Operating lease, existence of option to renew   false false
Lease Agreement | Vienna, Austria      
Leases      
Operating lease, existence of option to terminate   true true
Termination notice period   6 months 6 months
Lease Agreement | Dublin, Ireland      
Leases      
Operating lease, existence of option to renew   true true
Operating lease, monthly based fixed amount | €   € 7,000  
Lease Agreement | Dublin, Ireland | Minimum      
Leases      
Operating lease, renewal term 3 months   3 months