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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