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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

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