STOCK-BASED COMPENSATION (Details - P&L Impact) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 12,097	$ 7,938	$ 34,384	$ 13,068
Cost of revenue
Non-cash compensation expense related to equity awards
Total non-cash compensation	123	41	260	129
Selling and marketing expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	1,577	1,366	4,511	2,543
General and administrative expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	8,388	5,864	25,617	8,684
Product development
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 2,009	$ 667	$ 3,996	$ 1,712