Stockholders' equity - Narrative (Details)				1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Aug. 06, 2022 USD ($) shares	May 20, 2022 USD ($)	Aug. 24, 2021 $ / shares shares	Feb. 28, 2022 shares	Sep. 30, 2022 USD ($) award $ / shares shares	Dec. 31, 2021 USD ($) award $ / shares shares	Sep. 30, 2021 USD ($)	Mar. 31, 2021 $ / shares shares	Sep. 30, 2022 USD ($) vote period award $ / shares shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2018 installment shares	Jul. 11, 2022 $ / shares	Oct. 29, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares) | shares					50,000,000	50,000,000			50,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.00001	$ 0.00001			$ 0.00001
Number of votes per common stock | vote									1
Equity exchange participation rate					97.00%				97.00%
Stock-based compensation in capitalized costs	$ 45,700,000								$ 4,310,000	$ 1,451,000
Award vesting date												6 years
Aggregate intrinsic value of options exercised in period									11,000,000	46,700,000
Unrecognized compensation costs, options					$ 7,700,000				$ 7,700,000
Total shares of common stock reserved (in shares) | shares					18,289,709	34,559,618			18,289,709
Stock-based compensation					$ 24,969,000		$ 7,220,000		$ 53,043,000	23,704,000
Stock-based compensation capitalized as a software					1,600,000		500,000		$ 4,200,000	1,500,000
Tender Offer to Sell Common Stock to an Investor
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares sold in initial public offering (in shares) | shares								236,086
Initial public offering, price per share (in dollars per share) | $ / shares								$ 23.75
Stock-based compensation										1,600,000
Stock Options And SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range options and non options (in dollars per share) | $ / shares													$ 11.13
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion basis													1
Shares exchanged | shares	6,958,544
Unrecognized compensation costs, period for recognition (in years)									2 years 10 months 24 days
Unrecognized compensation costs, excluding options					$ 233,600,000				$ 233,600,000
Restricted stock issued for business combination, grant date fair value (in dollars per share) | $ / shares					$ 17.60	$ 27.64			$ 17.60
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting date	2 years
Award vesting period (in years)									3 years
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting date	3 years
Award vesting period (in years)									4 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)									10 years
Award vesting period (in years)									4 years
Unrecognized compensation costs, period for recognition (in years)									1 year
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)									10 years
Award vesting period (in years)									4 years
Unrecognized compensation costs, period for recognition (in years)									1 year 2 months 12 days
Granted (in shares) | shares									0
Unrecognized compensation costs, excluding options					$ 200,000				$ 200,000
Canceled (in shares) | shares									1,566
Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term (in years)									10 years
Granted (in shares) | shares											350,000	50,000
Unrecognized compensation costs, period for recognition (in years)									2 years 7 months 6 days
Number of Performance-Based Awards outstanding | award					1	2			1
Number of equal monthly installments | installment												48
Unrecognized compensation costs					$ 100,000				$ 100,000
Performance-Based Awards | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage											50.00%
Required annual recurring revenues, vesting term						$ 230,000,000					$ 230,000,000
Canceled (in shares) | shares				175,000
Performance-Based Awards | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation in capitalized costs									$ 900,000
Award vesting rights, percentage											50.00%
Required annual recurring revenues, vesting term											$ 330,000,000
Canceled (in shares) | shares				175,000
Contingently issuable shares under ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, period for recognition (in years)									1 year 7 months 6 days
Unrecognized compensation costs, excluding options					7,300,000				$ 7,300,000
Total shares of common stock reserved (in shares) | shares														2,800,000
Percent of outstanding shares									1.00%
ESPP discount percentage from market price, beginning of purchase period									15.00%
Consecutive offering period									24 months
Number of purchase periods | period									4
Purchase period									6 months
ESPP purchase price of common stock, percent of market price									85.00%
Shares issued under ESPP (in shares) | shares									525,037
Incremental compensation cost		$ 3,400,000
Restricted stock | CorpU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, period for recognition (in years)			3 years						1 year 10 months 24 days
Unrecognized compensation costs, excluding options					1,300,000				$ 1,300,000
Stock-based compensation					$ 200,000		$ 0		$ 500,000	$ 0
Restricted stock issued for business combination (in shares) | shares			61,300
Restricted stock issued for business combination, grant date fair value (in dollars per share) | $ / shares			$ 34.14
2021 Stock incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares) | shares					13,800,000				13,800,000
Annual percentage increase, term									0.05
Granted (in shares) | shares									0