Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total stock-based compensation expenses	$ 14,536	$ 8,896
Cost of revenues
Total stock-based compensation expenses	3,408	1,548
Sales and marketing
Total stock-based compensation expenses	2,754	1,806
Research and development
Total stock-based compensation expenses	3,770	2,012
General and administrative
Total stock-based compensation expenses	$ 4,604	$ 3,530