Property and Equipment, net

12 Months Ended

Dec. 31, 2016

Property Plant And Equipment [Abstract]

Note 7. Property and Equipment, net

Property and equipment, net consists of the following (in thousands):

	December 31,
	2016			2015
Machinery and equipment	$	3,491		$	2,808
Leasehold improvements, furniture, and computer hardware		13,407			10,669
Vehicles		44,788			33,048
Computer software		24,552			19,883
Total property and equipment		86,238			66,408
Less: Accumulated depreciation and amortization		(37,767	)		(21,542	)
Total solar energy systems, net	$	48,471		$	44,866

Depreciation and amortization expense was $18.8 million, $11.2 million and $6.4 million for the years ended December 31, 2016, 2015 and 2014, respectively.

The gross amount of assets under capital leases, primarily vehicles, was $46.2 million and $34.2 million as of December 31, 2016 and 2015. Accumulated depreciation related to these assets was $16.3 million and $6.2 million as of December 31, 2016 and 2015, respectively. Depreciation expense related to these assets was $10.8 million, $4.9 million and $1.2 million as of December 31, 2016, 2015 and 2014, respectively.