CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 184,358	$ 141,860	$ 334,494	$ 281,977
Cost of revenue	58,000	40,187	99,924	73,882
Gross profit	126,358	101,673	234,570	208,095
Operating expenses:
Sales and marketing	64,942	58,691	120,272	113,196
Research and development	28,338	24,337	52,423	52,083
General and administrative	25,620	22,239	50,345	45,179
Acquisition-related costs	20,093	0	26,904	0
Restructuring	9,733	0	9,733	0
Total operating expenses	148,726	105,267	259,677	210,458
Loss from operations	(22,368)	(3,594)	(25,107)	(2,363)
Other expense:
Interest expense	(18,219)	(5,378)	(23,720)	(10,744)
Other, net	(514)	1,081	(5,878)	2,474
Other expense, net	(18,733)	(4,297)	(29,598)	(8,270)
Loss before income tax provision	(41,101)	(7,891)	(54,705)	(10,633)
Income tax benefit (provision)	29,114	(914)	28,943	(1,636)
Net loss	$ (11,987)	$ (8,805)	$ (25,762)	$ (12,269)
Net loss per share, basic and diluted (USD per share)	$ (0.19)	$ (0.15)	$ (0.41)	$ (0.21)
Weighted average common shares outstanding, basic and diluted (in shares)	63,593	59,715	62,612	59,430