Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

The following is a summary of intangible assets as of December 31, 2015 (in thousands):

	Weighted-
	average
	useful life				Accumulated
	(in years)		Gross		amortization			Net
Developed technology - Silevo		10	$	115,000	$	(14,596	)	$	100,404
Developed technology - Zep Solar		7		60,100		(17,664	)		42,436
Trademarks and trade names		7		24,700		(7,256	)		17,444
Marketing database		5		17,427		(9,953	)		7,474
PowerSaver agreement		10		17,077		(3,961	)		13,116
Non-compete agreements		5		7,189		(3,272	)		3,917
Customer relationships		6		6,190		(542	)		5,648
Other		6		10,028		(5,223	)		4,805
Total		8.26	$	257,711	$	(62,467	)	$	195,244

The following is a summary of intangible assets as of December 31, 2014 (in thousands):

								Transfers to
	Weighted-							solar energy
	average							systems,			Write-offs
	useful life				Accumulated			leasedandtobe			and
	(in years)		Gross		amortization			leased			cancellations			Net
Developed technology - Silevo		10	$	115,000	$	(3,096	)	$	—		$	—			111,904
Developed technology - Zep Solar		7		60,100		(9,070	)		—			—			51,030
Trademarks and trade names		7		24,700		(3,728	)		—			—			20,972
Marketing database		5		17,427		(4,599	)		—			—			12,828
PowerSaver agreement		10		17,077		(2,253	)		—			—			14,824
Solar energy systems backlog		30		12,434		—			(10,755	)		(1,679	)		—
Non-compete agreements		5		6,959		(1,836	)		—			—			5,123
Other		6		10,028		(3,072	)	—			—				6,956
Total		9.35	$	263,725	$	(27,654	)	$	(10,755	)	$	(1,679	)	$	223,637

Summary of Carrying Value of Intangible Assets

The changes to the carrying value of intangible assets were as follows (in thousands):

	Year Ended December 31,
	2015			2014
Balance - beginning of the period	$	223,637		$	129,290
Acquisitions		6,420			119,000
Amortization		(34,813	)		(24,263	)
Transfers to solar energy systems, leased and to be leased		—			(140	)
Write-offs and cancellations		—			(250	)
Balance - end of the period	$	195,244		$	223,637

Summary of Amortization Expense for Intangible Assets

Amortization expense for intangible assets for the years ended December 31, 2015, 2014 and 2013 was allocated as follows (in thousands):

	Year Ended December 31,
		2015	2014		2013
Included in operating leases and solar energy incentives cost    of revenue	$	17,428	$	9,962	$	582
Included in solar energy systems and components sales cost    of revenue		3,337		2,605		—
Total included in cost of revenue		20,765		12,567		582
Included in sales and marketing		14,048		11,696		2,809
Total amortization expense	$	34,813	$	24,263	$	3,391

Summary of Future Amortization Expense for Intangible Assets

As of December 31, 2015, total future amortization expense for intangible assets was as follows (in thousands):

	Cost of Revenue		Operating Expense		Total
2016	$	20,697	$	11,689	$	32,386
2017		20,541		10,609		31,150
2018		20,541		9,237		29,778
2019		20,541		6,329		26,870
2020		19,821		6,129		25,950
Thereafter		44,532		4,578		49,110
Total	$	146,673	$	48,571	$	195,244

Summary of Carrying Value of Goodwill

The changes to the carrying value of goodwill were as follows (in thousands):

	Year Ended December 31,
	2015		2014
Balance - beginning of the period	$	315,920	$	148,879
Acquisitions		5,945		167,041
Balance - end of the period	$	321,865	$	315,920