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Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating Leases    
Remaining 2019 $ 301  
2020 587  
2021 471  
2022 443  
2023 455  
Thereafter 470  
Total expected minimum lease obligation 2,727  
Less: Amount representing interest (292)  
Operating lease liabilities 2,435  
Finance Leases    
Remaining 2019 300  
2020 532  
2021 518  
2022 317  
2023 40  
Thereafter 0  
Total expected minimum lease obligation 1,707  
Less: Amount representing interest (150)  
Present value of net minimum lease payments $ 1,557  
Operating Leases    
2019   $ 717
2020   611
2021   494
2022   466
2023   479
Thereafter   1,041
Total expected minimum lease obligation   3,808
Capital Leases    
2019   532
2020   532
2021   519
2022   317
2023   40
Thereafter   0
Total expected minimum lease obligation   1,940
Less: Amount representing interest   (151)
Present value of net minimum lease payments   $ 1,789