Income Taxes - Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Provision at statutory rate	12.50%	12.50%	12.50%
Foreign rate differential	14.90%	3.10%	(7.10%)
State income taxes, net of federal benefit	(6.20%)	2.70%	3.00%
Provision to return	(1.20%)	0.80%	(1.00%)
Tax credits	8.80%	(2.70%)	(1.30%)
Change in tax law	(1.80%)	(1.10%)	(6.20%)
Change in valuation allowance	52.00%	(29.10%)	51.00%
Change in unrecognized taxes	(28.80%)	(4.70%)	13.80%
Permanent differences	(70.70%)	31.20%	(14.10%)
Legal entity restructuring	21.10%	0.00%	0.00%
Taxes on unremitted earnings	(8.80%)	3.60%	3.90%
Other	(0.60%)	(1.70%)	0.40%
Effective income tax rate	(8.80%)	14.60%	54.90%

Effective Income Tax Rate Reconciliation, Legal Entity Restructuring, Percent

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Effective Income Tax Rate Reconciliation, Provision to Return, Percent

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Effective Income Tax Rate Reconciliation, Unrecognized Tax Benefits, Percent

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Effective Income Tax Rate Reconciliation, Withholdings, Percent

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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 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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