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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Unsecured promissory note $ 0 $ 1,080
Secured term note 6,590 0
Secured term note payable - related party 1,077 1,077
Secured promissory note - related party 3,859 5,000
Insurance and other notes payable 335 714
Less: amounts due within one year (3,623) (4,463)
Total long-term debt $ 8,238 $ 3,408