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Fair value - Summary of Fair Value of the Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Level 1 [Member]    
Assets:    
Cash equivalents $ 186,816 $ 86,440
Fair value, assets 142,304 205,844
Level 2 [Member]    
Assets:    
Cash equivalents 0 0
Fair value, assets 0 0
Level 3 [Member]    
Assets:    
Cash equivalents 0 0
Fair value, assets 0 0
Certificates of deposit [Member] | Level 1 [Member]    
Assets:    
Fair value, assets 55,864 3,918
Certificates of deposit [Member] | Level 2 [Member]    
Assets:    
Fair value, assets 0 0
Certificates of deposit [Member] | Level 3 [Member]    
Assets:    
Fair value, assets $ 0 0
U.S. Treasury bonds [Member] | Level 1 [Member]    
Assets:    
Fair value, assets   15,110
U.S. Treasury bonds [Member] | Level 2 [Member]    
Assets:    
Fair value, assets   0
U.S. Treasury bonds [Member] | Level 3 [Member]    
Assets:    
Fair value, assets   $ 0