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Stock Plan (Tables)
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity The following table summarizes the stock option activities under the Company’s stock plans for three months ended March 31, 2023 (in thousands, except for per share data):
 Options Outstanding

Number of
Shares		Weighted-
Average
Exercise Price Per Share
Weighted-
Average
Remaining
Contractual
Term (Years)
Aggregate
Intrinsic Value
Balance—December 31, 2022
33,417 $0.65 6.1$71,842 
Expired or canceled
(9)0.76
Exercised
(1,380)0.50 $3,182 
Balance—March 31, 2023
32,028 $0.66 5.9$66,402 
Options vested and exercisable—March 31, 2023
29,234 $0.64 5.8$61,176 
Schedule of RSU and PRSU Activity The following table summarizes the RSU activity under the Company’s stock plans for the three months ended March 31, 2023 (in thousands, except per share data):
RSUs and PRSUs
Number of
Shares		Weighted-
Average 
Grant-Date Fair Value
Price Per Share
Balance—December 31, 2022
37,176 $10.47 
Granted
8,217 2.93 
Vested
(3,519)10.81 
Canceled or forfeited
(600)5.45 
Balance—March 31, 2023
41,274 $9.01 
Employee Stock Option Valuation The following table summarizes the assumptions used and the resulting grant-date fair values of our 2021 ESPP:
Three Months Ended March 31,
20232022
Expected term
0.5 – 2.0 years
0.5 – 2.0 years
Expected volatility
35.2 – 48.0%
27.9 – 43.4%
Risk-free interest rate
0.4 – 4.7%
0.1 – 0.6%
Expected dividend yield
—%—%
Grant-date fair value per share
$0.85 – $14.36
$7.59 – $14.36
Stock-based Compensation Arrangement
The amount of stock-based compensation related to stock-based awards to employees in the Company’s consolidated statements of operations for the three months ended March 31, 2023 and 2022 were as follows (in thousands):
Three Months Ended March 31,
20232022
Costs of revenue
$844 $1,809 
Research and development
7,565 12,943 
Selling, general, and administrative
22,665 40,525 
Stock-based compensation, net of amounts capitalized
31,074 55,277 
Capitalized stock-based compensation
2,436 5,820 
Total stock-based compensation
$33,510 $61,097