Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

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 six months ended June 30, 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, 2020	8,019	$	10.35	6.87	$	473,371
Granted	275	52.28
Exercised	(1,349)	8.69
Cancelled	(219)	17.91
Outstanding at June 30, 2021	6,726	$	12.23	6.53	$	293,669
Options vested and exercisable at June 30, 2021	4,385	$	7.80	5.47	$	210,495

Summary of Activity for all Restricted Stock Units (RSUs)

The following table summarizes the activity for all restricted stock units (“RSUs”) under all of the Company’s equity incentive plans for the six months ended June 30, 2021 (shares in thousands):

	Number of Awards	Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2020	7,103	$	40.17
Granted	1,078	48.66
Issued	(2,175)	38.44
Cancelled / forfeited	(413)	29.83
Unvested balance at June 30, 2021	5,593	$	43.34

Summary 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):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Cost of customer agreements and incentives	$	1,992	$	930	$	4,224	$	2,876
Cost of solar energy systems and product sales	1,045		270		2,349		943
Sales and marketing	23,227		1,821		50,333		5,299
Research and development	803		466		1,479		1,541
General and administration	16,396		6,895		63,107		18,668
Total	$	43,463	$	10,382	$	121,492	$	29,327