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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