Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 4,838	$ 3,201	$ 8,647	$ 6,421
Cost of Operating Leases and Incentives
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	632	248	839	297
Cost of Solar Energy Systems and Product Sales
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	117	35	198	112
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	1,890	1,209	3,508	1,636
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	149	64	246	126
General and Administration
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 2,050	$ 1,645	$ 3,856	$ 4,250