Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total stock-based compensation expense	$ 11,596	$ 10,070	$ 36,915	$ 28,535
Cost of revenues
Total stock-based compensation expense	2,110	1,478	7,422	4,454
Sales and marketing
Total stock-based compensation expense	2,209	2,060	6,353	5,462
Research and development
Total stock-based compensation expense	2,901	2,598	9,780	7,083
General and administrative
Total stock-based compensation expense	$ 4,376	$ 3,934	$ 13,360	$ 11,536