Long-term Debt - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Apr. 20, 2020
Debt Instrument [Line Items]
Capital lease obligation	$ 9,103	$ 1,305
Long-term debt and lease obligation	9,103	9,369
Current portion of long-term debt	(397)	(6,370)
Long-term Debt	8,706	2,999
Promissory Note
Debt Instrument [Line Items]
Long-term debt	0	2,990
Convertible Notes Payable
Debt Instrument [Line Items]
Long-term debt	0	3,325
Paycheck Protection Program Loan
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 1,749	$ 1,749

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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