Stock-based compensation - Summary of Restricted Stock Units (Details) - Restricted stock units shares in Thousands	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Shares (in thousands)
Unvested balance at beginning of period (in shares) | shares	4,207
Granted (in shares) | shares	3,357
Vested (in shares) | shares	(1,083)
Forfeited (in shares) | shares	(907)
Unvested balance at end of period (in shares) | shares	5,574
Weighted- average grant date fair value
Unvested balance at beginning of period (in dollars per share) | $ / shares	$ 6.08
Granted (in dollars per share) | $ / shares	1.23
Vested (in dollars per share) | $ / shares	7.08
Forfeited (in dollars per share) | $ / shares	4.05
Unvested balance at end of period (in dollars per share) | $ / shares	$ 3.29