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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Remainder of 2019 $ 612  
2020 2,423  
2021 2,577  
2022 1,732  
2023 1,553  
After 2023 5,950  
Total lease payments 14,847  
Less: Discount 2,894  
Present value of lease liabilities 11,953  
Current portion of operating lease obligation 1,732 $ 0
Long-term portion of operating lease obligation $ 10,221 $ 0