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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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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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