Income taxes - Rate reconciliation (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
State income tax benefit, net of federal tax effect	3.10%	4.70%	2.90%
Permanent differences	0.00%	(0.70%)	(0.50%)
Foreign rate differential	(0.50%)	(0.50%)	0.20%
Remeasurement gain/loss	0.70%	(2.00%)	0.50%
Tax credits	2.30%	3.40%	2.00%
Valuation allowance	(24.40%)	(2.30%)	(2.00%)
Stock-based compensation	12.20%	6.90%	0.00%
Transaction costs	(0.80%)	(0.50%)	(0.40%)
Deferred rate change	0.90%	(1.00%)	(0.30%)
GILTI inclusion	0	0	(0.005)
Section 162(m)	(9.40%)	0.00%	0.00%
Other	0.90%	0.20%	(0.30%)
Effective tax rate	6.00%	29.20%	22.60%

Effective Income Tax Rate Reconciliation, Expense, Section 162(m) Limitation, Percent

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) attributable to permanent differences.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) attributable to remeasurement gain (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) attributable to transaction costs.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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