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Debt - Schedule of Outstanding Borrowings under SVB Term Loan (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Aug. 13, 2020
Term loan - current portion	$ 2,333
Term loan payable, non-current	11,912	$ 13,954
SVB Term Loan [Member]
Principal outstanding under term loan	14,000	14,000	$ 14,000
Term loan discount-interest	(121)	(158)
Term loan discount-unamortized deferred charges	(36)	(48)
Term loan discount-financing costs, net of accretion	(18)	(23)
Debt instrument, accrued final payment fee	420	183
Loans Payable, Noncurrent	14,245	13,954
Term loan - current portion	2,333
Term loan payable, non-current	$ 11,912	$ 13,954

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Debt instrument fee amount accrued.

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Loan discounts on financing costs.

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Term loan discounts interest.

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Unamortized deferred charges.

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Face (par) amount of debt instrument at time of issuance.

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Including the current and noncurrent portions, aggregate 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).

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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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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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