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Commitments and Contingencies - Operating Leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Leases        
Operating lease liabilities   $ 1,709    
Operating Lease, Liability, Statement of Financial Position [Extensible List]   Other Liabilities, Noncurrent    
Operating lease expense   $ 1,500 $ 1,400 $ 1,300
King of Prussia        
Leases        
Weighted-average remaining lease term of operating leases   4 years    
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