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Debt - Summary of total debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total future principal payments	$ 5,011	$ 29,420
Less: current portion of long-term debt	(1,025)	(4,381)
Long-term debt	3,986	25,039
Notes payable to banks
Debt Instrument [Line Items]
Total future principal payments	$ 5,011	29,420
Notes payable to banks | Equipment Note 6
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	2.89%
Term (years)	7 years
Total future principal payments	$ 0	12,896
Notes payable to banks | Equipment Note 7
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	3.09%
Term (years)	5 years
Total future principal payments	$ 0	6,980
Notes payable to banks | Equipment Note 8
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	2.75%
Term (years)	5 years
Total future principal payments	$ 5,011	5,513
Notes payable to banks | Equipment Note 9
Debt Instrument [Line Items]
Stated Interest Rate (per annum)	3.01%
Term (years)	7 years
Total future principal payments	$ 0	4,031
Revolving loans
Debt Instrument [Line Items]
Term (years)	5 years
Total future principal payments	$ 0	$ 0

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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