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Stockholders’ Equity and Equity-Based Compensation - Summary of non-cash equity-based compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	$ 7,751	$ 6,429	$ 12,375	$ 12,035
Stock options
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	2,176	1,500	3,067	2,966
RSUs
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	5,575	4,929	9,308	9,069
Cost of revenue
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	105	140	190	314
Sales and marketing
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	675	715	1,257	1,142
Product development
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	1,252	1,738	2,427	3,215
General and administrative
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Non-cash equity-based compensation	$ 5,719	$ 3,836	$ 8,501	$ 7,364

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