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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Assets, fair value disclosure $ 316,593 $ 39,006
Cash Equivalents [Member] | Money Market Fund [Member]    
Assets:    
Assets, fair value disclosure 316,593 39,006
Level 1 [Member]    
Assets:    
Assets, fair value disclosure 316,593 39,006
Level 1 [Member] | Cash Equivalents [Member] | Money Market Fund [Member]    
Assets:    
Assets, fair value disclosure 316,593 39,006
Level 2 [Member]    
Assets:    
Assets, fair value disclosure 0 0
Level 2 [Member] | Cash Equivalents [Member] | Money Market Fund [Member]    
Assets:    
Assets, fair value disclosure 0 0
Level 3 [Member]    
Assets:    
Assets, fair value disclosure 0 0
Level 3 [Member] | Cash Equivalents [Member] | Money Market Fund [Member]    
Assets:    
Assets, fair value disclosure $ 0 $ 0