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Income Taxes - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Income Taxes [Line Items]  
Income tax operating loss carryforwards $ 206.1
Income tax operating loss carryforwards not expired 100.2
Income tax operating loss carryforwards, expire between 2032 and 2037 $ 41.9
Minimum [Member]  
Income Taxes [Line Items]  
Income tax examination year under examination P3Y
Maximum [Member]  
Income Taxes [Line Items]  
Income tax examination year under examination P5Y
Earliest Tax Year [Member] | R&D Credit Carryovers [Member]  
Income Taxes [Line Items]  
Tax credit carryovers expiration year 2032
Latest Tax Year [Member] | R&D Credit Carryovers [Member]  
Income Taxes [Line Items]  
Tax credit carryovers expiration year 2037
State and Local Jurisdiction [Member]  
Income Taxes [Line Items]  
Income tax operating loss carryforwards $ 64.0
State and Local Jurisdiction [Member] | R&D Credit Carryovers [Member]  
Income Taxes [Line Items]  
Tax credit carryovers $ 0.9
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]  
Income Taxes [Line Items]  
Income tax operating loss carryforwards, expiration year 2027
State and Local Jurisdiction [Member] | Latest Tax Year [Member]  
Income Taxes [Line Items]  
Income tax operating loss carryforwards, expiration year 2037
Federal [Member]  
Income Taxes [Line Items]  
Income tax operating loss carryforwards $ 142.1
Federal [Member] | R&D Credit Carryovers [Member]  
Income Taxes [Line Items]  
Tax credit carryovers $ 1.9
Federal [Member] | Earliest Tax Year [Member]  
Income Taxes [Line Items]  
Income tax operating loss carryforwards, expiration year 2032
Federal [Member] | Latest Tax Year [Member]  
Income Taxes [Line Items]  
Income tax operating loss carryforwards, expiration year 2037