STOCK-BASED COMPENSATION (Details - P&L Impact) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 7,938	$ 2,348	$ 13,068	$ 7,410
Cost of revenue
Non-cash compensation expense related to equity awards
Total non-cash compensation	41	29	129	99
Selling and marketing expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	1,366	737	2,543	2,118
General and administrative expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	5,864	1,072	8,684	3,511
Product development
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 667	$ 510	$ 1,712	$ 1,682