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Commitments and Contingencies - Operating Leases (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
May 31, 2019
USD ($)
Leases        
Operating lease liabilities $ 1,872   $ 1,872  
Operating lease expense 400   700  
Short term lease expense $ 200   $ 500  
King of Prussia        
Leases        
Weighted-average remaining lease term of operating leases 4 years 6 months   4 years 6 months  
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    
ROU assets       $ 200
Operating lease liabilities       $ 200
Lease Agreement | Dublin, Ireland | Minimum        
Leases        
Operating lease, renewal term 3 months   3 months