Stock-based compensation - Schedule of Nonvested Restricted Stock Awards Activity (Details) - Restricted Stock Units	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Outstanding shares
Restricted stock units, beginning balance (in shares) | shares	9,326,572
Granted (in shares) | shares	3,983,474
Canceled (in shares) | shares	(1,559,964)
Vested (in shares) | shares	(828,921)
Restricted stock units, ending balance (in shares) | shares	10,921,161
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 7.82
Granted (in dollars per share) | $ / shares	4.25
Canceled (in dollars per share) | $ / shares	6.44
Vested (in dollars per share) | $ / shares	7.46
Ending balance (in dollars per share) | $ / shares	$ 6.75