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Commitments and Contingencies - Operating Leases (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Leases    
Operating lease liabilities   $ 1,498
Operating lease expense   $ 800
King of Prussia    
Leases    
Weighted-average remaining lease term of operating leases   3 years 4 months 24 days
Weighted-average discount rate (as a percent)   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