Property and Equipment, net - Schedule of Property and Equipment, net (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 86,238	$ 66,408
Less: Accumulated depreciation and amortization	(37,767)	(21,542)
Total solar energy systems, net	48,471	44,866
Machinery and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	3,491	2,808
Leasehold Improvements, Furniture and Computer hardware
Property Plant And Equipment [Line Items]
Total property and equipment, gross	13,407	10,669
Vehicles
Property Plant And Equipment [Line Items]
Total property and equipment, gross	44,788	33,048
Computer Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 24,552	$ 19,883