Summary of Significant Accounting Policies - Schedule of Revenues from External Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Entity Wide Revenue Major Customer [Line Items]
Operating leases	$ 125,197	$ 86,332	$ 63,962
Incentives	43,220	31,672	20,044
Operating leases and incentives	168,417	118,004	84,006
Solar energy systems and product sales	285,481	186,602	114,551
Total revenue	453,898	304,606	198,557
Solar Energy Systems
Entity Wide Revenue Major Customer [Line Items]
Solar energy systems and product sales	127,727	50,191	23,687
Products
Entity Wide Revenue Major Customer [Line Items]
Solar energy systems and product sales	$ 157,754	$ 136,411	$ 90,864