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Significant Accounting Policies - Operating Leases (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]  
2020 $ 707
2021 595
2022 601
2023 607
2024 613
2025 619
Thereafter 207
Total future minimum lease payments 3,949
Less imputed interest (1,170)
Total operating lease liabilities 2,779
Lessee, Operating Sublease, Description [Abstract]  
2020 509
2021 525
2022 540
2023 556
2024 573
2025 590
Thereafter 199
Total future minimum lease payments $ 3,492