Property, plant and equipment, net (Tables)

12 Months Ended

Dec. 31, 2015

The components of property, plant and equipment as of December 31, were as follows:


	2015			2014
Land	$	260		$	260
Building and improvements		8,189			5,015
Office furniture and equipment		4,675			3,705
Tooling and equipment		21,381			13,736
Transportation equipment		560			525
Construction in progress		3,011			6,056

Property, plant and equipment, at cost		38,076			29,297
Accumulated depreciation		(12,075	)		(8,405	)

Property, plant and equipment, net	$	26,001		$	20,892

Estimated useful lives by major asset category are as follows:


		Life (in years)
Building and improvements		Lesser of (i) 39 years, (ii) expected useful life of improvement or (iii) life of lease (including likely extension thereof)
Tooling and equipment		Up to 10 years
Office furniture and equipment		3 – 10
Transportation equipment		3 – 5