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Debt - Summary of the Carrying Values of the Loan Agreement Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Carrying value $ 1,693 $ 2,057
EB-5 Loan Agreement | Loans payable    
Debt Instrument [Line Items]    
Principal outstanding 1,500 1,500
Plus: accrued interest 226 181
Less: unamortized debt issuance costs (33) (45)
Carrying value $ 1,693 $ 1,636