Annual report pursuant to Section 13 and 15(d)

Leases - Maturities of Operating Lease Liabilities (Details)

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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
2021 $ 2,662  
2022 2,458  
2023 2,424  
2024 2,424  
2025 2,424  
Thereafter 14,556  
Total undiscounted lease payments 26,948  
Less: present value adjustment (9,986)  
Present value of lease liabilities $ 16,962  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndOtherAccuredLiabilitiesCurrent us-gaap:AccountsPayableAndOtherAccuredLiabilitiesCurrent