STOCK-BASED COMPENSATION (Details - P&L Impact) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 2,900	$ 2,429	$ 5,130	$ 5,062
Cost of revenue
Non-cash compensation expense related to equity awards
Total non-cash compensation	45	29	88	70
Selling and marketing expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	692	655	1,177	1,381
General and administrative expense
Non-cash compensation expense related to equity awards
Total non-cash compensation	1,601	1,129	2,820	2,439
Product development
Non-cash compensation expense related to equity awards
Total non-cash compensation	$ 562	$ 616	$ 1,045	$ 1,172