Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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 six months ended June 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 January 1, 2017	12,897		$	5.94	7.49
Granted	4,585		5.03
Exercised	(207	)	2.49
Cancelled	(524	)	7.82
Outstanding at June 30, 2017	16,751		$	5.68	7.75	$	32,028
Options vested and exercisable at June 30, 2017	7,961		$	5.40	6.34	$	18,378

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, 2017 (shares in thousands):

	Number of Awards		Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2017	4,106		$	6.87
Granted	2,887		5.10
Issued	(538	)	6.15
Forfeited	(644	)	5.79
Unvested balance at June 30, 2017	5,811		$	6.13

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,
	2017		2016		2017		2016
Cost of operating leases and incentives	$	1,110	$	632	$	1,861	$	839
Cost of solar energy systems and product sales	156		117		270		198
Sales and marketing	807		1,890		2,724		3,508
Research and development	186		149		335		246
General and administration	3,256		2,050		6,199		3,856
Total	$	5,515	$	4,838	$	11,389	$	8,647