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

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