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Income Taxes - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, federal	$ 376.7
Net operating loss carryforwards, state	290.2
Deferred Tax Assets Operating Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Increase in valuation allowance	15.8
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Amount not subject to expiration	257.2
Research and development credit carryforwards	4.0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Research and development credit carryforwards	1.9
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Amount not subject to expiration	157.8
Research and development credit carryforwards	$ 0.3

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