Stock-based compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

The Company recognized stock-based compensation for all stock options in the statements of operations and comprehensive loss as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Cost of revenue	$	783	$	637	$	657
Research and development	14,611		7,240		6,059
Sales and marketing	7,065		3,823		640
General and administrative	10,862		13,663		4,701
Total stock-based compensation	$	33,321	$	25,363	$	12,057

The following table summarizes stock-based compensation expense by award type (in thousands):


	Year Ended December 31,
	2022		2021		2020
RSUs	$	24,236	$	13,306	$	—
Stock Options	8,851		12,035		11,064
Employee stock purchase plan	220		—		—
RSAs	14		22		993
Total stock-based compensation	$	33,321	$	25,363	$	12,057

Schedule of Stock Option Activity

Stock option activity for the years ended December 31, 2022, 2021 and 2020 is as follows:


	Number of Shares Underlying Outstanding Options	Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Outstanding—January 1, 2020	1,599,645	$	6.58	8.8	$	3,020
Options granted	37,663,242	0.45		9.4	363,941
Options exercised	(12,221,364)	0.20			121,106
Options cancelled	(1,309,020)	1.58			—
Outstanding—December 31, 2020	25,732,503	$	0.56	9.5	$	245,746
Options assumed through acquisition	823,114	5.05		8.3	125
Options granted	645,796	10.26		9.3	—
Options exercised	(2,155,348)	0.22			10,742
Options cancelled	(916,969)	0.30			4,492
Outstanding—December 31, 2021	24,129,096	$	1.01	8.6	$	100,992
Options exercised	(2,133,181)	0.20			4,639
Options cancelled	(978,753)	2.86			1,015
Outstanding—December 31, 2022	21,017,162	$	1.01	7.7	$	8,285
Vested and expected to vest—December 31, 2022	21,017,162	$	1.01	7.7	$	8,285
Exercisable—December 31, 2022	12,398,966	$	0.91	7.7	$	5,178

Schedule of Stock Options Outstanding and Exercisable

The following table summarizes information about stock options outstanding and exercisable at December 31, 2022.


		Options Outstanding
Exercise Price		Options Outstanding	Weighted Average Remaining Contractual Life (Years)	Options Exercisable
$	0.18	3,773,175	7.5	2,933,506
$	0.21	8,814,619	7.8	4,908,617
$	1.42	7,524,114	7.8	4,075,561
$	5.24	259,457	5.8	212,201
$	10.26	645,797	8.4	269,081
		21,017,162		12,398,966

Schedule of Stock Options Valuation Assumptions

The weighted-average assumptions in the Black-Scholes option-pricing models used to determine the fair value of stock options granted during the years ended December 31, 2021 and 2020 were as follows:


	Year Ended December 31,
	2021	2020
Expected term (in years)	6.0	5.0 - 6.1
Risk-free interest rate	1.0%	0.3% - 1.5%
Expected volatility	63.2%	57.4% - 63.3%
Expected dividend rate	0%	0%

The weighted-average assumptions in the Black-Scholes option-pricing models used to determine the fair value of stock options assumed during the year ended December 31, 2021 were as follows:


			Year Ended December 31,
			2021
Expected term (in years)			3.1 - 5.6
Risk-free interest rate			0.8% - 1.3%
Expected volatility			44.1% - 48.6%
Expected dividend rate			0%

Schedule of Nonvested Restricted Stock Awards Activity

A summary of RSUs activity under the Plan is as follows:


	Number of Shares	Weighted Average Grant Date Fair Value (per share)
Unvested—January 1, 2021	—	$	—
Assumed through acquisition	4,490,980	6.55
Granted during the year	5,899,954	9.39
Canceled during the year	(552,072)	8.89
Vested during the year	(512,290)	10.30
Unvested—December 31, 2021	9,326,572	$	7.82
Granted during the year	15,710,791	$	2.74
Canceled during the year	(4,071,027)	$	5.60
Vested during the year	(4,456,143)	$	6.16
Unvested—December 31, 2022	16,510,193	$	3.98