Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

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



	Three Months Ended March 31,
	2019		2018
Customer agreements	$	78,528	$	61,649
Incentives	21,322		5,341
Customer agreements and incentives	99,850		66,990

Solar energy systems	58,436		33,998
Products	36,218		43,375
Solar energy systems and product sales	94,654		77,373
Total revenue	$	194,504	$	144,363

Cash and restricted cash consists of the following (in thousands):



	March 31, 2019		December 31, 2018
Cash	$	245,604	$	226,625
Restricted cash, current and long-term	64,330		77,774
Total	$	309,934	$	304,399

Cash and restricted cash consists of the following (in thousands):



	March 31, 2019		December 31, 2018
Cash	$	245,604	$	226,625
Restricted cash, current and long-term	64,330		77,774
Total	$	309,934	$	304,399

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



	March 31, 2019			December 31, 2018
Customer receivables	$	64,598		$	64,180
Other receivables	2,179			1,466
Rebates receivable	3,027			3,017
Allowance for doubtful accounts	(2,282		)	(2,228		)
Total	$	67,522		$	66,435

The opening balance of deferred revenue was $564.9 million as of December 31, 2017. Deferred revenue consists of the following (in thousands):



	March 31, 2019		December 31, 2018
Under Customer Agreements:
Payments received	$	543,945	$	538,926
Financing component balance	39,577		37,801
	583,522		576,727

Under SREC contracts:
Payments received	108,002		12,977
Financing component balance	1,937		1,921
	109,939		14,898

Total	$	693,461	$	591,625