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Leases - Future Payment Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Leases    
2019 $ 916  
2020 3,651  
2021 4,462  
2022 4,302  
2023 3,719  
Thereafter 17,087  
Total lease payments 34,137  
Less interest 5,988  
Present value of lease liabilities $ 28,149 $ 498