XML 61 R55.htm IDEA: XBRL DOCUMENT v3.19.3
Leases - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
Sep. 30, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average remaining lease term 8 years 6 months   8 years 6 months  
Lease cost | $ $ 820 $ 827 $ 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, weighted average remaining lease term 4 years 2 months 12 days   4 years 2 months 12 days  
Maximum        
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average remaining lease term 10 years 3 months 18 days   10 years 3 months 18 days