Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 18,723	$ 15,823	$ 9,218
Cost of Operating Leases and Incentives
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	2,039	1,649	155
Cost of Solar Energy Systems and Product Sales
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	409	236	682
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	7,831	5,242	897
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	515	205	270
General and Administration
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation expense recognized	$ 7,929	$ 8,491	$ 7,214