CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 199,498	$ 144,952	$ 533,992	$ 426,929
Cost of revenue	64,503	37,167	164,427	111,049
Gross profit	134,995	107,785	369,565	315,880
Operating expenses:
Sales and marketing	71,850	57,815	192,122	171,011
Research and development	29,665	25,695	82,088	77,778
General and administrative	28,884	20,562	79,229	65,741
Acquisition-related costs	4,852	0	31,756	0
Restructuring	1,362	0	11,095	0
Total operating expenses	136,613	104,072	396,290	314,530
(Loss) income from operations	(1,618)	3,713	(26,725)	1,350
Other expense:
Interest expense	(19,609)	(3,321)	(43,329)	(9,889)
Other, net	5,817	(1,018)	(61)	(2,720)
Other expense, net	(13,792)	(4,339)	(43,390)	(12,609)
Loss before income tax provision	(15,410)	(626)	(70,115)	(11,259)
Income tax (provision) benefit	(371)	(591)	28,572	(2,227)
Net loss	$ (15,781)	$ (1,217)	$ (41,543)	$ (13,486)
Net loss per share, basic and diluted (USD per share)	$ (0.25)	$ (0.02)	$ (0.66)	$ (0.23)
Weighted average common shares outstanding, basic and diluted (in shares)	64,375	60,652	63,204	59,841