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Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019
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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Right-of-use asset | $ 11,694 |
Lease liabilities | $ 12,373 |
Adjustments for New Accounting Principle, Early Adoption [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Right-of-use asset |  | $ 11,900
Accrued Rent |  | 686
Lease liabilities |  | $ 12,600

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