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Leases - Maturities of Operating Leases Under Previous Accounting Standard (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]      
2019 $ 422    
2020   $ 477  
2021   $ 368  
Total minimum lease payments     $ 1,267