Basis of presentation and description of business - Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020
Revenue:
Total revenue	$ 95,621		$ 70,548	[1]	$ 262,586		$ 192,865	[1]
Cost of revenue:
Amortization expense	5,198		2,679	[1]	10,835		8,034	[1]
Total cost of revenue	26,470		15,158	[1]	63,068		43,801	[1]
Gross profit	69,151		55,390	[1]	199,518		149,064	[1]
Operating expenses:
Sales and marketing	40,856		23,773	[1]	103,640		67,558	[1]
Research and development	25,608		12,757	[1]	58,437		37,344	[1]
General and administrative	25,536		13,845	[1]	69,288		31,588	[1]
Amortization expense	7,025		5,633	[1]	18,275		16,941	[1]
Total operating expenses	99,025		56,008	[1]	249,640		153,431	[1]
Loss from operations	(29,874)		(618)	[1]	(50,122)		(4,367)	[1]
Interest expense, net	(1,386)		(1,207)	[1]	(1,608)		(10,675)	[1]
Loss on extinguishment of debt	(449)		(5,213)	[1]	(449)		(5,213)	[2]
Foreign currency transaction loss	(269)		(154)	[1]	(795)		(471)	[1]
Other income, net	0		0	[1]	0		91	[1]
Loss before income tax benefit	(31,978)		(7,192)	[1]	(52,974)		(20,635)	[1]
Income tax benefit	1,595		1,804	[1]	1,535		4,917	[1]
Net loss	$ (30,383)	[1]	$ (5,388)	[1]	$ (51,439)	[1]	$ (15,718)	[2]
Net loss per share, basic (in dollars per share)	$ (0.26)		$ (0.05)	[1]	$ (0.44)		$ (0.15)	[1]
Net loss per share, diluted (in dollars per share)	$ (0.26)		$ (0.05)	[1]	$ (0.44)		$ (0.15)	[1]
Weighted-average shares used to compute net loss per share, basic (in shares)	118,640,565		113,203,074	[1]	117,983,463		106,333,836	[1]
Weighted-average shares used to compute net loss per share, diluted (in shares)	118,640,565		113,203,074	[1]	117,983,463		106,333,836	[1]
Subscription
Revenue:
Total revenue	$ 90,700		$ 65,634	[1]	$ 245,900		$ 178,438	[1]
Cost of revenue:
Cost of revenue	18,317		10,032	[1]	44,206		28,020	[1]
Services
Revenue:
Total revenue	4,083		3,897	[1]	12,015		10,616	[1]
Cost of revenue:
Cost of revenue	2,955		2,447	[1]	8,027		7,747	[1]
License
Revenue:
Total revenue	$ 838		1,017	[1]	$ 4,671		3,811	[1]
As Previously Reported
Revenue:
Total revenue			70,404				193,025
Cost of revenue:
Amortization expense			2,679				8,034
Total cost of revenue			15,239				43,897
Gross profit			55,165				149,128
Operating expenses:
Sales and marketing			23,251				65,735
Research and development			12,736				37,282
General and administrative			13,921				31,813
Amortization expense			5,633				16,941
Total operating expenses			55,541				151,771
Loss from operations			(376)				(2,643)
Interest expense, net			(1,207)				(10,675)
Loss on extinguishment of debt			(5,213)				(5,213)
Foreign currency transaction loss			(154)				(471)
Other income, net							91
Loss before income tax benefit			(6,950)				(18,911)
Income tax benefit			1,857				5,105
Net loss			$ (5,093)				$ (13,806)
Net loss per share, basic (in dollars per share)			$ (0.04)				$ (0.13)
Net loss per share, diluted (in dollars per share)			$ (0.04)				$ (0.13)
Weighted-average shares used to compute net loss per share, basic (in shares)			113,203,074				106,333,836
Weighted-average shares used to compute net loss per share, diluted (in shares)			113,203,074				106,333,836
As Previously Reported | Subscription
Revenue:
Total revenue			$ 65,782				$ 179,148
Cost of revenue:
Cost of revenue			10,117				28,127
As Previously Reported | Services
Revenue:
Total revenue			3,605				10,066
Cost of revenue:
Cost of revenue			2,443				7,736
As Previously Reported | License
Revenue:
Total revenue			1,017				3,811
Adjustments | Commissions
Revenue:
Total revenue			0				0
Cost of revenue:
Amortization expense			0				0
Total cost of revenue			0				0
Gross profit			0				0
Operating expenses:
Sales and marketing			488				1,722
Research and development			0				0
General and administrative			0				0
Amortization expense			0				0
Total operating expenses			488				1,722
Loss from operations			(488)				(1,722)
Interest expense, net			0				0
Loss on extinguishment of debt			0				0
Foreign currency transaction loss			0				0
Other income, net							0
Loss before income tax benefit			(488)				(1,722)
Income tax benefit			119				430
Net loss			(369)				(1,292)
Adjustments | Commissions | Subscription
Revenue:
Total revenue			0				0
Cost of revenue:
Cost of revenue			0				0
Adjustments | Commissions | Services
Revenue:
Total revenue			0				0
Cost of revenue:
Cost of revenue			0				0
Adjustments | Commissions | License
Revenue:
Total revenue			0				0
Adjustments | Other
Revenue:
Total revenue			144				(160)
Cost of revenue:
Amortization expense			0				0
Total cost of revenue			(81)				(96)
Gross profit			225				(64)
Operating expenses:
Sales and marketing			34				101
Research and development			21				62
General and administrative			(76)				(225)
Amortization expense			0				0
Total operating expenses			(21)				(62)
Loss from operations			246				(2)
Interest expense, net			0				0
Loss on extinguishment of debt			0				0
Foreign currency transaction loss			0				0
Other income, net							0
Loss before income tax benefit			246				(2)
Income tax benefit			(172)				(618)
Net loss			74				(620)
Adjustments | Other | Subscription
Revenue:
Total revenue			(148)				(710)
Cost of revenue:
Cost of revenue			(85)				(107)
Adjustments | Other | Services
Revenue:
Total revenue			292				550
Cost of revenue:
Cost of revenue			4				11
Adjustments | Other | License
Revenue:
Total revenue			$ 0				$ 0

[1] Certain prior period amounts have been revised to correct immaterial errors. See Note 1 for more information.

[2] Certain prior period amounts have been revised to correct immaterial errors. See Note 1 for more information.