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Income Taxes - Additional Information (Detail) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 53,600,000 |
Uncertain tax positions that required recognition | 0 | $ 0
Prior To December 31, 2017 |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 42,800,000 |

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