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Summary of Changes in Fair Value of Liabilities in Level 3 of Fair Value Hierarchy (Detail) - Viscount Earnout Consideration
$ in Thousands
Mar. 31, 2020
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Balance as of December 31, 2019 $ 750
Balance as of March 31, 2020 $ 750