Equity Incentive Plans and Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-Based Compensation [Line Items]
Share-based compensation expense	$ 12,034	$ 10,200	$ 8,976
Cost of revenue
Stock-Based Compensation [Line Items]
Share-based compensation expense	736	972	995
Sales and marketing
Stock-Based Compensation [Line Items]
Share-based compensation expense	3,423	2,792	2,385
Research and development
Stock-Based Compensation [Line Items]
Share-based compensation expense	2,245	2,168	1,898
General and administrative
Stock-Based Compensation [Line Items]
Share-based compensation expense	$ 5,630	$ 4,268	$ 3,698