Borrowings - Summary of Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Principal outstanding and final fee	$ 41,000	$ 41,000
Less: Unamortized debt issuance costs	(587)	(661)
Unaccreted value of final fee	(783)	(884)
Outstanding debt, net of debt issuance costs and unaccreted value of final fee	39,630	39,455
Long-term borrowings	$ 39,630	$ 39,455

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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, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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