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Other Assets - Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Prepaid expenses |  | $ 817 | $ 1,092
Advance payments to vendors |  | 666 |
Prepaid rent and other |  | 12 | 210
Other receivables |  | 329 | 701
Total other current assets | $ 9,771 | $ 1,824 | $ 2,003

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