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Accrued and Other Liabilities - Summary Of Accrued And Other Current Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Payables and Accruals [Abstract] |  |  |
Accrued expenses |  | $ 2,049 | $ 2,853
Warranty liabilities |  | 267 | 145
Contract liabilities | $ 956 | 225 | 0
Payroll payable |  | 473 | 818
Accrued bonuses |  | 350 | 0
Short-term lease liabilities and other |  | 162 | 83
Total accrued and other current liabilities |  | $ 3,526 | $ 3,899

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