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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Accumulated deficit | $ (419,716) | $ (446,252)
Accounting Standards Update 2016-13 | Revision of Prior Period Accounting Standards Update Adjustment |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Accumulated deficit | $ 1,000 |

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