Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 15,823	$ 9,218	$ 2,655
Cost of Operating Leases and Incentives
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	1,649	155	116
Cost of Solar Energy Systems and Product Sales
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	236	682
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	5,242	897	474
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	205	270	379
General and Administration
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 8,491	$ 7,214	$ 1,686