v3.19.3

Income Taxes - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2019 USD ($)
Income Tax Contingency [Line Items] |
Cumulative effect on retained deficit | $ 0
Unrecognized tax benefits | $ 0
Earliest Tax Year [Member] |
Income Tax Contingency [Line Items] |
Open tax year | 2014
Latest Tax Year [Member] |
Income Tax Contingency [Line Items] |
Open tax year | 2018

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