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Short-term investments - Summary of Short-term Investments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]          
Cost $ 125,089   $ 125,089   $ 170,464
Gross Unrealized Losses (361) $ (596) (1,167) $ (3,026)  
Fair Value 124,581   124,581   168,789
Short-Term Investments [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Gross Unrealized Gains     470   140
Gross Unrealized Losses     (978)   (1,815)
Corporate Debt Securities [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Cost 90,860   90,860   151,245
Fair Value 90,180   90,180   149,576
Corporate Debt Securities [Member] | Short-Term Investments [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Gross Unrealized Gains     257   100
Gross Unrealized Losses     (937)   (1,769)
Asset-Backed Securities [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Cost 1,276   1,276   16,269
Fair Value 1,281   1,281   16,254
Asset-Backed Securities [Member] | Short-Term Investments [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Gross Unrealized Gains     9   31
Gross Unrealized Losses     (4)   (46)
Government securities [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Cost 32,953   32,953   2,950
Fair Value $ 33,120   33,120   2,959
Government securities [Member] | Short-Term Investments [Member]          
Debt Securities, Available-for-Sale [Line Items]          
Gross Unrealized Gains     204   9
Gross Unrealized Losses     $ (37)   $ 0