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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Summary of Stock Option Activity
The following table summarizes the activity for all stock options under all of the Company’s equity incentive plans for the years ended December 31, 2022 and 2021 (shares and aggregate intrinsic value in thousands):
Number of Options
Weighted
Average
Exercise Price
Weighted
Average
Remaining
Contractual Life
Aggregate
Intrinsic
Value
Outstanding at December 31, 20208,019 $10.35 6.87$473,371 
Granted
641 47.06 
Exercised
(1,977)8.88 
Canceled(426)24.70 
Outstanding at December 31, 20216,257 13.60 6.19140,326 
Granted
942 28.10 
Exercised
(1,401)8.04 
Canceled(581)28.17 
Outstanding at December 31, 20225,217 $16.08 5.68$58,784 
Options vested and exercisable at December 31, 20223,820 $11.36 4.58$55,466 
Options vested and expected to vest at December 31, 20225,217 $16.08 5.68$58,784 
Schedule of Estimated Fair Value of Stock Options
The Company estimated the fair value of stock options with the following assumptions:
Year Ended December 31,
202220212020
Risk-free interest rate
1.60% - 3.80%
0.90% - 1.30%
 0.30 % - 1.50 %
Volatility
65.60% - 69.40%
63.00% - 67.80%
54.40 % - 59.70 %
Expected term (in years)
6.10
6.00 - 6.10
5.30 - 6.10
Expected dividend yield
—%
—%
—%
Schedule of Activity for All RSUs
The following table summarizes the activity for all RSUs under all of the Company’s equity incentive plans for the years ended December 31, 2022 and 2021 (shares in thousands):
Shares
Weighted
Average Grant
Date Fair
Value
Unvested balance at December 31, 20207,103 $40.17 
Granted
1,992 48.12 
Issued
(3,755)42.70 
Canceled / forfeited(855)34.05 
Unvested balance at December 31, 20214,485 42.73 
Granted
4,500 27.66 
Issued
(2,968)40.31 
Canceled / forfeited(1,475)35.85 
Unvested balance at December 31, 20224,542 $31.60 
Schedule of Stock-Based Compensation Expense
The Company recognized stock-based compensation expense, including ESPP expenses, in the consolidated statements of operations as follows (in thousands): 
Year Ended December 31,
202220212020
Cost of customer agreements and incentives$9,181 $11,469 $4,315 
Cost of solar energy systems and product sales
9,274 5,775 1,582 
Sales and marketing
56,857 104,087 53,366 
Research and development
2,667 3,806 2,518 
General and administration
32,654 85,863 108,806 
Total
$110,633 $211,000 $170,587