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Leases - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
ft²
Sep. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]        
Lease cost | $ $ 836 $ 820 $ 2,500 $ 2,500
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 2 months 12 days   3 years 2 months 12 days  
Maximum        
Lessee, Lease, Description [Line Items]        
Operating lease, remaining lease term 9 years 3 months 18 days   9 years 3 months 18 days