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Related Party Transactions (Details) - Convertible debt instruments - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]      
Accrued interest on convertible debt instruments issued to members of executive management and board of directors   $ (4) $ (4)
Prepaid rent and deposit for a leased property from a related party $ 7    
Convertible debt instruments issued to members of executive management and board of directors     $ 117
Interest rate     7.50%