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v3.21.1

Income tax provision (benefit) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Reconciliation of effective tax rate |  |
Income tax at federal statutory rate | 21.00% | 21.00%
Goodwill impairment charges (Note 7) | 0.00% | 39.20%
State income tax, net of federal income tax benefit | 3.80% | 1.70%
Tax impact of share-based compensation | 2.10% | 7.40%
Non-deductible executive compensation | 0.90% | 2.00%
Foreign tax rate differences | 0.60% | 3.70%
Change in unrecognized tax benefits, including interest and penalties | 0.30% | (2.90%)
Payables and receivables for prior year tax returns | (0.90%) | 2.80%
Research and development tax credit | (0.60%) | (3.30%)
Return to provision adjustments | 0.00% | (2.30%)
Change in valuation allowances | 0.00% | 0.80%
Other | 0.20% | 0.80%
Effective tax rate | 27.40% | 70.90%

X
- 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 payables and receivables for prior year tax returns. + References No definition available. + Details
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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 changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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