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Leases -Operating Lease Maturity (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Leases  
2020 $ 663
2021 717
2022 737
2023 1
Total undiscounted lease payments 2,118
Less: imputed interest (291)
Total operating lease liabilities $ 1,827
Weighted average remaining lease term 3 years
weighted average incremental borrowing rate (as a percent) 9.10%