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Summary of Significant Accounting Policies - Summary of Reclassifications of Stock-Based Compensation Expenses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 20,491 $ 26,499 $ 18,926
General and Administrative Expense [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense   26,499 18,926
Sales and Marketing Expense [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense   2,729 462
Research and Development Expense [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation expense   $ 2,614 $ 1,600