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Leases -Operating Lease Maturity (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Leases  
2019 (remaining 3 months) $ 151
2020 663
2021 717
2022 737
2023 1
Total undiscounted lease payments 2,269
Less: imputed interest (337)
Total operating lease liabilities $ 1,932
Weighted average remaining lease term 3 years 2 months 12 days
weighted average incremental borrowing rate (as a percent) 9.10%