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Leases - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
ft²
agreement
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]          
Lease cost | $ $ 827 $ 814   $ 1,700 $ 1,700
Number of agreements | agreement     2    
Minimum          
Lessee, Lease, Description [Line Items]          
Operating lease, remaining lease term 2 years 4 months 24 days     2 years 4 months 24 days  
Maximum          
Lessee, Lease, Description [Line Items]          
Operating lease, remaining lease term 8 years 6 months     8 years 6 months  
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)     13,500 57,360