Basis of presentation and description of business - IPO (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended			9 Months Ended
		Jul. 24, 2020	Sep. 30, 2021	Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020		Dec. 31, 2020
Business Acquisition [Line Items]
Proceeds from initial public offering, net of underwriting discounts and commissions						$ 0	$ 326,316	[1]
Offering costs						$ 543	6,601	[1]
Common stock, shares authorized (in shares)		500,000,000	500,000,000			500,000,000			500,000,000
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001			$ 0.001			$ 0.001
Preferred stock authorized (in shares)		50,000,000	50,000,000			50,000,000			50,000,000
Preferred stock, par value (in dollars per share)		$ 0.001	$ 0.001			$ 0.001			$ 0.001
Repayment of debt		$ 205,000					205,000
Accrued interest paid		3,400
Prepayment penalty		2,000
Write-off of debt issuance cost		$ 3,200
Loss on debt extinguishment			$ 449	$ 5,213	[2]	$ 449	5,213	[1]
IPO
Business Acquisition [Line Items]
Issuance of common stock (shares)		13,500,000
Offering price (in dollars per share)		$ 26.00
Proceeds from initial public offering, net of underwriting discounts and commissions		$ 319,000
Underwriting discount and commissions		24,700
Offering costs		$ 7,300
Issuance of common stock	[2]			318,993			318,993
Private placement
Business Acquisition [Line Items]
Issuance of common stock (shares)		85,880
Issuance of common stock		$ 2,200		$ 2,233	[2]		$ 2,233	[2]

[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.