Borrowings - Future Payment Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Future payment obligations
2022	$ 33,031
Total repayment obligations	33,031
Less: Unamortized discount and debt issuance costs	(235)
Less: Unaccreted value of final fee	(532)
Loan payable	32,264
Less: Loan payable, current portion	(32,264)	$ (4,167)
Loan payable, net of current portion	$ 0	$ 46,621

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.

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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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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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