Consolidated Statements of Operations (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity-based compensation expense included in cost of revenues	$ 428	$ 352	$ 328
Equity-based compensation expenses included in research and development, net	2,873	2,349	2,205
Equity-based compensation expense included in sales and marketing	1,248	1,115	806
Equity-based compensation expense included in general and administrative	$ 2,255	$ 2,045	$ 1,749