Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Revenues from External Customers (Details)

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Summary of Significant Accounting Policies - Schedule of Revenues from External Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue, Major Customer [Line Items]      
Operating leases $ 174,664 $ 125,197 $ 86,332
Incentives 56,769 43,220 31,672
Operating leases and incentives 231,433 168,417 118,004
Solar energy systems and product sales 298,266 285,481 186,602
Total revenue 529,699 453,898 304,606
Solar energy systems      
Revenue, Major Customer [Line Items]      
Solar energy systems and product sales 113,953 127,727 50,191
Products      
Revenue, Major Customer [Line Items]      
Solar energy systems and product sales $ 184,313 $ 157,754 $ 136,411