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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021 and 2020 (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, 201910,784 $7.38 6.52$71,745 
Assumed through acquisition2,565 10.23 
Granted
1,740 17.48 
Exercised
(6,608)7.40 
Cancelled(462)9.36 
Outstanding at December 31, 20208,019 10.35 6.87473,371 
Granted
641 47.06 
Exercised
(1,977)8.88 
Cancelled(426)24.70 
Outstanding at December 31, 20216,257 $13.60 6.19$140,326 
Options vested and exercisable at December 31, 20214,362 $8.38 5.18$114,465 
Options vested and expected to vest at December 31, 20216,257 $13.60 6.19$140,326 
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,
202120202019
Risk-free interest rate
0.90% - 1.30%
0.30 % - 1.50 %
 1.70 % - 2.59 %
Volatility
63.00% - 67.80%
54.40 % - 59.70 %
52.90 % - 55.07 %
Expected term (in years)
6.00 - 6.10
5.30 - 6.10
6.10 - 6.12
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, 2021 and 2020 (shares in thousands):
Shares
Weighted
Average Grant
Date Fair
Value
Unvested balance at December 31, 20193,943 $11.42 
Assumed through acquisition3,033 70.54 
Granted
5,295 34.71 
Issued
(4,222)30.10 
Cancelled / forfeited
(946)32.08 
Unvested balance at December 31, 20207,103 40.17 
Granted
1,992 48.12 
Issued
(3,755)42.70 
Cancelled / forfeited
(855)34.05 
Unvested balance at December 31, 20214,485 $42.73 
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,
202120202019
Cost of customer agreements and incentives$11,469 $4,315 $2,434 
Cost of solar energy systems and product sales
5,775 1,582 844 
Sales and marketing
104,087 53,366 5,162 
Research and development
3,806 2,518 1,439 
General and administration
85,863 108,806 16,427 
Total
$211,000 $170,587 $26,306