Stock-based compensation - Summary of Restricted Stock Units (Detail) - Restricted stock units shares in Thousands	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Shares (in thousands)
Unvested balance at beginning of period (in shares) | shares	3,193
Granted (in shares) | shares	1,504
Vested (in shares) | shares	(860)
Forfeited (in shares) | shares	(1,485)
Unvested balance at end of period (in shares) | shares	2,352
Weighted- average grant date fair value
Unvested balance at beginning of period (in dollars per share) | $ / shares	$ 16.21
Granted (in dollars per share) | $ / shares	7.40
Vested (in dollars per share) | $ / shares	17.53
Forfeited (in dollars per share) | $ / shares	12.57
Unvested balance at end of period (in dollars per share) | $ / shares	$ 12.44