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Income tax provision (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Reconciliation of effective tax rate
Income tax at federal statutory rate	21.00%	21.00%
Change in valuation allowances	100.40%	0.10%
Tax impact of share-based compensation	11.70%	0.90%
State income tax, net of federal income tax benefit	2.50%	2.40%
Non-deductible executive compensation	2.50%	1.70%
Foreign tax rate differences	1.70%	1.70%
Tax on repatriation of foreign earnings	1.40%	4.90%
Non-deductible acquisition costs	0.10%	1.50%
Basis difference in Australian web hosting business	(117.60%)	0.00%
Research and development tax credit	(1.10%)	(0.90%)
Other	0.30%	(0.20%)
Effective tax rate	22.90%	33.10%
Deferred tax asset, difference between book and tax basis of investment in Australian web hosting business	$ 14,764
Change in valuation allowance	$ 12,601

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- Definition

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 nondeductible acquisition costs.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the entity's investment in its wholly-owned subsidiaries.

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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 the repatriation of foreign earnings.

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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 research tax credit.

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