Stock-based compensation - Summary of Restricted Stock Units (Detail) - Restricted stock units shares in Thousands	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Shares (in thousands)
Unvested balance at beginning of period (in shares) | shares	3,193
Granted (in shares) | shares	1,291
Vested (in shares) | shares	(238)
Forfeited (in shares) | shares	(340)
Unvested balance at end of period (in shares) | shares	3,906
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	7.85
Vested (in dollars per share) | $ / shares	26.67
Forfeited (in dollars per share) | $ / shares	14.79
Unvested balance at end of period (in dollars per share) | $ / shares	$ 12.96