Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	$ 30,532	$ 20,230	$ 16,162
Cost of revenue
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	650	348	237
Sales and marketing
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	2,841	1,675	735
Research and development
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	1,293	1,707	1,937
General and administrative
Includes stock-based compensation expense as follows:
Total stock-based compensation expense	$ 25,748	$ 16,500	$ 13,253