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Stock-based compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
Stock option activity for the nine months ended September 30, 2021 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—December 31, 202025,732,503 $0.39 9.60$245,746 
Options granted645,796 10.26 
Options exercised(913,279)0.14 
Options cancelled(505,213)0.14 
Outstanding—September 30, 202124,959,807 $0.67 8.7$167,460 
Vested and expected to vest—September 30, 202124,959,807 $0.67 8.7$167,460 
Exercisable—September 30, 20218,844,727 $0.31 8.1$61,987 
Schedule of Stock Options Valuation Assumptions
The following table summarizes the weighted-average assumptions used in estimating the fair value of options granted in the nine months ended September 30, 2021, using the Black-Scholes option-pricing model:

Nine Months Ended
September 30, 2021
Expected term (years)6.00
Expected volatility63.19 %
Risk-free interest rate1.03 %
Expected dividend rate— %
Schedule of Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable at September 30, 2021.
Options OutstandingOptions Exercisable
Exercise
Price		Options
Outstanding		Weighted
Average
Remaining
Contractual
Life (Years)		Weighted
Average
Exercise
Price		Options
Exercisable		Weighted
Average
Remaining
Contractual
Life (Years)		Weighted
Average
Exercise
Price
$0.18 6,350,481 8.3$0.18 3,889,338 7.8$0.18 
$0.21 10,394,961 8.8$0.21 3,186,660 8.2$0.21 
$0.37 35,159 0.4$0.37 35,159 0.4$0.37 
$1.42 7,524,116 9$1.42 1,724,276 9$1.42 
$5.57 7,976 0.2$5.57 7,976 0.2$5.57 
$8.25 1,318 0.2$8.25 1,318 0.2$8.25 
$10.26 645,796 9.5$10.26 — $— 
24,959,807 8,844,727 
Schedule of Nonvested Restricted Stock Awards Activity
A summary of RSA activity under the 2015 Plan is as follows:
Number of
Shares
Weighted Average
Grant Date Fair
Value (per share)
Unvested – December 31, 202040,754 $0.67 
Granted during the period— — 
Canceled during the period— — 
Vested during the period(17,466)0.67 
Unvested — September 30, 2021
23,288 $0.67 
Schedule of Nonvested Restricted Stock Units Activity
A summary of RSU activity is as follows:

Number of
Shares
Weighted Average
Grant Date Fair
Value (per share)
Unvested – December 31, 2020— $— 
Granted during the period4,332,224 9.50 
Canceled during the period(27,636)8.86 
Vested during the period(463,043)10.46 
Unvested — September 30, 2021
3,841,545 $9.21 
Schedule of Stock-based Compensation
The Company recognized stock-based compensation for all stock options in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Cost of revenue$206 $505 $457 $606 
Research and development2,063 4,889 4,305 5,177 
Sales and marketing1,717 319 2,702 408 
General and administrative3,161 1,543 11,093 1,700 
Total stock-based compensation$7,147 $7,256 $18,557 $7,891