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Debt - Schedule of Outstanding Borrowings under SVB Term Loan (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Aug. 13, 2020
Debt Instrument [Line Items]
Less current portion	$ 7,000	$ 5,833
Term loan payable, non-current	5,428	8,652
SVB Term Loan [Member]
Debt Instrument [Line Items]
Principal outstanding under term loan	11,667	14,000	$ 14,000
Term loan discount-interest	(49)	(84)
Term loan discount-unamortized deferred charges	(60)	(76)
Term loan discount-financing costs, net of accretion	(7)	(12)
Debt instrument, accrued final payment fee	877	657
Loans Payable, Noncurrent	12,428	14,485
Less current portion	7,000	5,833
Term loan payable, non-current	$ 5,428	$ 8,652

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