Income Taxes - Effective Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision at federal statutory tax rate	21.00%	21.00%	34.00%
State taxes, net of federal tax impact	0.00%	0.00%	(3.00%)
Change in valuation allowance	(12.00%)	(11.00%)	13.00%
Foreign tax rate differential	(8.00%)	(7.00%)	(10.00%)
Federal statutory tax rate change	0.00%	0.00%	(32.00%)
Other	(2.00%)	(4.00%)	(3.00%)
Net deferred tax (liabilities) assets	(1.00%)	(1.00%)	(1.00%)

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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