STOCK-BASED COMPENSATION (Details - P&L Impact) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 10,797	$ 12,097	$ 40,832	$ 34,384
Cost of revenue
Non-cash compensation expense related to equity awards
Total non-cash compensation	208	123	558	260
Selling and marketing expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	835	1,577	4,867	4,511
General and administrative expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	8,627	8,388	30,534	25,617
Product development
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 1,127	$ 2,009	$ 4,873	$ 3,996