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Leases (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Right of use assets $ 494 $ 451 $ 0
Operating lease, liability 494 451 $ 0
Lease costs 385    
Short-term lease cost $ 285    
Accounting Standards Update 2016-02      
Lessee, Lease, Description [Line Items]      
Right of use assets   451  
Operating lease, liability   $ 451  
Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 10 years