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Revenues from Contracts with Customers (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable [1] $ 3,477 $ 4,638
Current expected credit loss $ 80 $ 136
[1] Net of current expected credit loss allowance of $80 as of June 30, 2020 (December 31, 2019 – $136)