Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 5,874	$ 3,809
Cost of Operating Leases and Incentives
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	751	207
Cost of Solar Energy Systems and Product Sales
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	114	81
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	1,917	1,618
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	149	97
General and Administration
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 2,943	$ 1,806