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Intangible Assets and Deferred Charges - Schedule of Deferred Charges (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Deferred charges, gross $ 388 $ 792
Accumulated amortization of deferred charges (21) (337)
Deferred charges, net $ 367 $ 455