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Leases - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2015
Lessee, Lease, Description [Line Items]      
Renewal term (up to) 15 years    
Termination option (within) 1 year    
Sale and leaseback transaction     $ 2,000,000.0
Deferred gain from sale and leaseback transaction   $ 93,000  
Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 30 years