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Leases - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
ft²
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Lease cost | $ $ 834 $ 817
San Diego, California    
Lessee, Lease, Description [Line Items]    
Area leased (in square feet) 82,200  
Plymouth Meeting, Pennsylvania    
Lessee, Lease, Description [Line Items]    
Area leased (in square feet) 57,360  
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease, remaining lease term 3 years 8 months 12 days  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease, remaining lease term 9 years 9 months 19 days