Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [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, 2017 (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, 2016	12,897		$	5.94	7.49
Granted	4,656		5.06
Exercised	(538	)	2.92
Cancelled	(687	)	8.11
Outstanding at September 30, 2017	16,328		$	5.70	7.56	$	11,942
Options vested and exercisable at September 30, 2017	7,952		$	5.49	6.19	$	8,875

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, 2017 (shares in thousands):

	Number of Awards		Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2016	4,106		$	6.87
Granted	3,129		5.21
Issued	(943	)	7.61
Forfeited	(914	)	5.78
Unvested balance at September 30, 2017	5,378		$	5.77

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,
	2017			2016		2017		2016
Cost of operating leases and incentives	$	(69	)	$	711	$	1,792	$	1,550
Cost of solar energy systems and product sales	171			86		441		284
Sales and marketing	1,580			2,484		4,304		5,992
Research and development	259			115		594		361
General and administration	3,164			1,983		9,363		5,839
Total	$	5,105		$	5,379	$	16,494	$	14,026