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Debt - Summary of the Carrying Values for the Components of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total carrying value of debt, net	$ 1,693	$ 2,057
PPP Note \| Notes payable
Debt Instrument [Line Items]
Total carrying value of debt, net	0	421
EB-5 Loan Agreement \| Loans payable
Debt Instrument [Line Items]
Total carrying value of debt, net	$ 1,693	$ 1,636

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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