Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 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	1,086	9.96
Exercised	(1,009)	5.88
Cancelled	(162)	9.00
Outstanding at March 31, 2020	10,699	$	7.75	6.80	$	33,024
Options vested and exercisable at March 31, 2020	6,922	$	6.52	5.80	$	26,557

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 three months ended March 31, 2020 (shares in thousands):

	Number of Awards	Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2019	3,943	$	11.42
Granted	1,747	10.30
Issued	(663)	10.88
Cancelled / forfeited	(184)	10.17
Unvested balance at March 31, 2020	4,843	$	11.14

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 March 31,
	2020		2019
Cost of customer agreements and incentives	$	1,946	$	632
Cost of solar energy systems and product sales	673		167
Sales and marketing	3,478		1,128
Research and development	1,075		336
General and administration	11,773		3,520
Total	$	18,945	$	5,783