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Quarterly Financial Data - Condensed Consolidated Statement of Operations (Parenthetical) (Detail) - USD ($) | 3 Months Ended
--- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Quarterly Financial Information [Line Items] |  |  |
Reclassification of operating expense to change in fair value of contingent consideration |  | $ 1,100,000 |
Maximum [Member] |  |  |
Quarterly Financial Information [Line Items] |  |  |
Reclassification of net income (loss) from discontinued operations to continuing operations | $ 10,000 | $ 10,000 | $ 10,000

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