Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Revenue from External Customers

Revenues from external customers for each group of similar products and services are as follows (in thousands):

	Year Ended December 31,
	2015		2014		2013
Operating leases	$	86,332	$	63,962	$	44,249
Incentives		31,672		20,044		10,491
Operating leases and incentives		118,004		84,006		54,740
Solar energy systems		50,191		23,687		—
Products		136,411		90,864		—
Solar energy systems and product sales		186,602		114,551		—
Total revenue	$	304,606	$	198,557	$	54,740

Schedule of Accounts Receivable

Accounts receivable, net consists of the following (in thousands):

	December 31,
	2015			2014
Customer receivables	$	46,169		$	24,477
Customer deposits		10,150			11,135
Other receivables		4,376			5,936
Rebates receivable		1,221			2,344
Allowance for doubtful accounts		(1,641	)		(703	)
Total	$	60,275		$	43,189

Depreciated Property and Equipment, Net Estimated Useful Lives

Property and equipment is depreciated on a straight-line basis over the following periods:

Leasehold improvements		Lesser of estimated useful life of the asset or lease term, which is typically 2 to 6 years
Furniture		5 years
Computer hardware and software		3 years
Machinery and equipment		5-7 years
Automobiles		4-5 years

Amortized Finite-Lived Intangible Assets Estimated Useful lives

Finite-lived intangible assets are initially recorded at fair value and presented net of accumulated amortization. Intangible assets are amortized on a straight-line basis over their estimated useful lives as follows:

Customer relationships		6-10 years
Backlog		1 year
Developed technology		5 years
Trade names		4 months to 5 years

Schedule of Deferred Revenue

Deferred revenue consists of the following (in thousands):

	December 31,
	2015		2014
Customer payments	$	370,754	$	311,193
Rebates and incentives		102,827		101,318
ITCs		126,853		85,767
SRECs		18,358		13,846
Total	$	618,792	$	512,124