Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Parenthetical) (Detail) - FeedbackNow [Member] - USD ($)	Jul. 06, 2018	Jun. 30, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Maximum contingent consideration payable based on the financial performance of acquired company	$ 4,200,000	$ 2,600,000
Contingent consideration payable period	2 years
Accrued Expenses and Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of contingent consideration to be paid		$ 2,600,000	$ 2,500,000