Income Taxes (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Tax Credit Carryforward [Line Items]
Deferred tax assets, net	$ 39.2	$ 39.2
Unrecognized tax benefits	7.0	7.0
Research and development tax credit studies		$ 2.8
Overall effective tax rate, after discrete period adjustments (as a percentage)		(79.80%)
Effective tax rate, before discrete period adjustment (as a percentage)		(137.00%)
Restricted Stock Units (RSUs)
Tax Credit Carryforward [Line Items]
Discrete tax benefit, stock-based compensation		$ 6.6
United Kingdom
Tax Credit Carryforward [Line Items]
Release of valuation allowance	1.3
Canada
Tax Credit Carryforward [Line Items]
Release of valuation allowance	0.3
State Tax
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits recognized during period	$ 7.0	$ 7.0

Effective Income Tax Rate Reconciliation, Deduction, Stock-based Compensation

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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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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Amount 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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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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