Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Deferred Charges - Schedule of Intangible Assets (Details)

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Intangible Assets and Deferred Charges - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangible assets, gross $ 30,866 $ 30,866
Accumulated amortization of intangible assets (20,120) (19,440)
Intangible assets, net $ 10,746 $ 11,426