Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

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 nine months ended September 30, 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, 2019	10,784	$	7.38	6.52	$	71,745
Granted	1,556	12.85
Exercised	(4,187)	6.95
Cancelled	(382)	9.16
Outstanding at September 30, 2020	7,771	$	8.61	6.74	$	532,004
Options vested and exercisable at September 30, 2020	4,545	$	6.33	5.41	$	321,566

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 nine months ended September 30, 2020 (shares in thousands):

	Number of Awards	Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2019	3,943	$	11.42
Granted	3,304	14.10
Issued	(2,509)	11.81
Cancelled / forfeited	(528)	11.01
Unvested balance at September 30, 2020	4,210	$	13.35

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 September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Cost of customer agreements and incentives	$	922	$	594	$	3,798	$	1,849
Cost of solar energy systems and product sales	205		209		1,148		566
Sales and marketing	1,890		1,352		7,189		3,782
Research and development	317		404		1,858		1,149
General and administration	4,883		4,295		23,551		12,074
Total	$	8,217	$	6,854	$	37,544	$	19,420