Fair value - Summary of Fair Value of the Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Level 1 [Member]
Assets:
Cash equivalents	$ 24,151	$ 135,704
Available for sale securities	88,588
Liabilities:
Fair value, Liabilities	0	0
Fair Value, Net Asset (Liability), Total	112,739	135,704
Level 2 [Member]
Assets:
Cash equivalents	0	0
Available for sale securities	0
Liabilities:
Fair value, Liabilities	0	0
Fair Value, Net Asset (Liability), Total	0	0
Level 3 [Member]
Assets:
Cash equivalents	0	0
Available for sale securities	0
Liabilities:
Fair value, Liabilities	(41,969)	(27,596)
Fair Value, Net Asset (Liability), Total	$ (41,969)	$ (27,596)