Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Total revenue	$ 1,300,658	$ 883,026	$ 674,860
Cost of Revenue:
Total cost of revenue	258,857	166,959	129,958
Gross profit	1,041,801	716,067	544,902
Operating expenses:
Research and development	301,970	205,589	158,237
Sales and marketing	649,681	452,081	340,685
General and administrative	144,949	109,225	92,971
Total operating expenses	1,096,600	766,895	591,893
Loss from operations	(54,799)	(50,828)	(46,991)
Other expense:
Interest income	1,173	7,773	19,429
Interest expense	(30,282)	(37,049)	(22,818)
Other income (expense)	10,090	(711)	(393)
Total other expense	(19,019)	(29,987)	(3,782)
Loss before income tax expense	(73,818)	(80,815)	(50,773)
Income tax expense	(4,019)	(4,216)	(2,973)
Net loss	$ (77,837)	$ (85,031)	$ (53,746)
Net loss per common share, basic and diluted	$ (1.66)	$ (1.90)	$ (1.28)
Weighted average common shares used in computing basic and diluted net loss per common share:	46,891	44,757	42,025
Subscription [Member]
Revenue:
Total revenue	$ 1,258,319	$ 853,025	$ 646,266
Cost of Revenue:
Total cost of revenue	211,132	130,685	98,510
Professional Services and Other [Member]
Revenue:
Total revenue	42,339	30,001	28,594
Cost of Revenue:
Total cost of revenue	$ 47,725	$ 36,274	$ 31,448