Summary of Significant Accounting Policies - Schedule of Revenues from External Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue, Major Customer [Line Items]
Operating leases	$ 47,034	$ 32,980	$ 82,096	$ 58,307
Incentives	18,303	12,414	31,339	21,627
Operating leases and incentives	65,337	45,394	113,435	79,934
Solar energy systems and product sales	72,511	77,144	128,530	141,347
Total revenue	137,848	122,538	241,965	221,281
Solar energy systems
Revenue, Major Customer [Line Items]
Solar energy systems and product sales	28,078	35,878	48,697	66,070
Products
Revenue, Major Customer [Line Items]
Solar energy systems and product sales	$ 44,433	$ 41,266	$ 79,833	$ 75,277