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Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument [Line Items] |  |
Interest expense | $ 400 | $ 504
Unsecured promissory note |  |
Debt Instrument [Line Items] |  |
Interest expense | 0 | 0
Secured term note |  |
Debt Instrument [Line Items] |  |
Interest expense | 59 | 0
Secured term note payable - related party |  |
Debt Instrument [Line Items] |  |
Interest expense | 20 | 42
Secured promissory note - related party |  |
Debt Instrument [Line Items] |  |
Interest expense | 291 | 435
Insurance and other notes payable |  |
Debt Instrument [Line Items] |  |
Interest expense | $ 30 | $ 27

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