STOCK-BASED COMPENSATION (Details - P&L Impact) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 13,158	$ 15,982	$ 25,075	$ 30,035
Cost of revenue
Non-cash compensation expense related to equity awards
Total non-cash compensation	333	197	575	350
Selling and marketing expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	1,597	2,283	2,753	4,032
General and administrative expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	9,729	11,686	18,852	21,907
Product development
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 1,499	$ 1,816	$ 2,895	$ 3,746