Basis of presentation and description of business - Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020		Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents		$ 227,148		$ 194,868	$ 177,457	[1]
Trade accounts receivable, net of allowances		69,486		69,056
Income taxes receivable		652		632
Deferred contract costs		11,673		8,284
Prepaid expenses		18,677		13,283
Other current assets		3,592		1,113
Total current assets		331,228		287,236
Equipment and leasehold improvements, net		17,529		15,130
Goodwill		846,057	$ 541,850	541,480	539,818		$ 539,818	$ 539,818
Other intangible assets, net		276,750		202,878
Deferred contract costs, non-current		27,830		22,202
Other assets		30,685		5,359
Total assets		1,530,079		1,074,285
Current liabilities:
Accounts payable		12,717		6,967
Accrued liabilities		98,598		31,916
Income taxes payable		730		713
Deferred revenues		211,029		160,002
Total current liabilities		323,074		199,598
Deferred revenues, non-current		59,338		45,507
Deferred tax liability, net		11,455		5,087
Other liabilities		27,969		13,079
Total liabilities		783,310		263,271
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock		0		0
Common stock		119		117
Additional paid‑in capital		898,428		903,116
Accumulated deficit		(143,658)		(92,219)
Total stockholders’ equity	[2]	746,769	$ 803,959	811,014	810,318		492,070	500,722
Total liabilities and stockholders’ equity		$ 1,530,079		1,074,285
As Previously Reported
Current assets:
Cash and cash equivalents				194,868
Trade accounts receivable, net of allowances				69,056
Income taxes receivable				632
Deferred contract costs				9,959
Prepaid expenses				13,283
Other current assets				1,113
Total current assets				288,911
Equipment and leasehold improvements, net				12,755
Goodwill				541,480
Other intangible assets, net				202,878
Deferred contract costs, non-current				26,770
Other assets				5,359
Total assets				1,078,153
Current liabilities:
Accounts payable				6,967
Accrued liabilities				31,574
Income taxes payable				713
Deferred revenues				160,443
Total current liabilities				199,697
Deferred revenues, non-current				45,507
Deferred tax liability, net				6,422
Other liabilities				11,046
Total liabilities				262,672
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock				0
Common stock				117
Additional paid‑in capital				903,116
Accumulated deficit				(87,752)
Total stockholders’ equity				815,481	815,386		496,843	503,878
Total liabilities and stockholders’ equity				1,078,153
Adjustments | Commissions
Current assets:
Cash and cash equivalents				0
Trade accounts receivable, net of allowances				0
Income taxes receivable				0
Deferred contract costs				(1,675)
Prepaid expenses				0
Other current assets				0
Total current assets				(1,675)
Equipment and leasehold improvements, net				0
Goodwill				0
Other intangible assets, net				0
Deferred contract costs, non-current				(4,568)
Other assets				0
Total assets				(6,243)
Current liabilities:
Accounts payable				0
Accrued liabilities				0
Income taxes payable				0
Deferred revenues				0
Total current liabilities				0
Deferred revenues, non-current				0
Deferred tax liability, net				(1,535)
Other liabilities				0
Total liabilities				(1,535)
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock				0
Common stock				0
Additional paid‑in capital				0
Accumulated deficit				(4,708)
Total stockholders’ equity				(4,708)	(4,122)		(3,753)	(2,830)
Total liabilities and stockholders’ equity				(6,243)
Adjustments | Other
Current assets:
Cash and cash equivalents				0
Trade accounts receivable, net of allowances				0
Income taxes receivable				0
Deferred contract costs				0
Prepaid expenses				0
Other current assets				0
Total current assets				0
Equipment and leasehold improvements, net				2,375
Goodwill				0
Other intangible assets, net				0
Deferred contract costs, non-current				0
Other assets				0
Total assets				2,375
Current liabilities:
Accounts payable				0
Accrued liabilities				342
Income taxes payable				0
Deferred revenues				(441)
Total current liabilities				(99)
Deferred revenues, non-current				0
Deferred tax liability, net				200
Other liabilities				2,033
Total liabilities				2,134
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock				0
Common stock				0
Additional paid‑in capital				0
Accumulated deficit				241
Total stockholders’ equity				241	$ (946)		$ (1,020)	$ (326)
Total liabilities and stockholders’ equity				$ 2,375

[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.