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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | Nov. 01, 2019 | Sep. 30, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Stock issued during period, shares, new issues (in shares) | 14.4 |
Maximum |  |
Loss Contingencies [Line Items] |  |
Loss contingency, estimate of possible loss |  | $ 5.0

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