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Commitments and Contingencies - Operating Leases (Details)
3 Months Ended
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
USD ($)
item
May 31, 2019
USD ($)
Leases      
Operating lease liabilities   $ 1,977,000  
Operating lease expense   348,000  
Short term lease expense   $ 222,000  
Weighted-average remaining lease term of operating leases   4 years 8 months 12 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 | San Diego, California      
Leases      
Operating lease, existence of option to renew true true  
Operating lease, number of renewal terms | item   1  
Operating lease, renewal term   36 months  
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  
Lease Agreement | Dublin, Ireland | Estimate      
Leases      
ROU assets     $ 150,000
Operating lease liabilities     $ 150,000