v3.20.4

Income taxes - Rate reconciliation (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation from U.S. federal statutory tax rate to effective income taxes rate |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
State and local | 5.50% | 11.20% | 19.70%
Foreign rate differential | 0.90% | 0.20% | (0.50%)
Stock options | 2.70% | (52.20%) | (47.20%)
Excess tax benefits from stock-based compensation | (2.90%) | 95.50% | 106.40%
Non-controlling interests | (0.30%) | 0.20% | 5.50%
Valuation allowance | (26.70%) | (74.70%) | (90.70%)
Uncertain tax positions | 0.00% | 0.00% | 2.30%
Convertible Notes | 0.00% | 0.00% | 94.90%
Other | (1.10%) | (0.90%) | (5.90%)
Income taxes | (0.90%) | 0.30% | 105.50%

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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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