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Fair Value Measurements - Schedule of Reconciliation For Contingent Consideration Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Acquisition date fair value $ 28,560
Increase in fair value recognized in operating expenses 5,400
Payment made (15,000)
Contingent consideration at March 31 $ 18,960