Balance Sheet Details:

Inventories

Inventories are comprised of the following:



	December 31,
	2016		2015
Materials	$	32,993	$	39,022
Work-in-process	18,764		18,918
Finished goods	13,728		13,550
Total inventories	$	65,485	$	71,490

The Company has established reserves of $10,545 and $8,896 at December 31, 2016 and 2015, respectively, for slow moving and obsolete inventory. During 2016, the Company recorded a net charge in cost of revenues of $2,953 for the write-down of inventory for excess parts, for older product lines and for parts that were rendered obsolete by design and engineering advancements. In 2016, the Company disposed of $1,304 of inventory. During 2015, the Company recorded a net charge in cost of revenues of $3,676 for the write-down of inventory for excess parts, for older product lines and for parts that were rendered obsolete by design and engineering advancements. In 2015, the Company disposed of $1,780 of inventory.

Property, Plant and Equipment

Property, plant and equipment, net is comprised of the following:



	December 31,
	2016			2015
Land and building	$	2,584		$	5,024
Machinery and equipment	23,493			21,683
Furniture and fixtures	2,699			3,414
Computer equipment and software	5,204			5,304
Leasehold improvements	8,116			7,884
	42,096			43,309
Accumulated depreciation	(30,238		)	(30,963		)
Total property, plant and equipment, net	$	11,858		$	12,346

Depreciation expense amounted to $3,677, $3,951 and $4,686 for the years ended December 31, 2016, 2015 and 2014, respectively.

Other current liabilities

Other current liabilities is comprised of the following:



	December 31,
	2016		2015
Intangible asset acquisition - Stella Alliance	$	1,000	$	2,000
Litigation accrual	—		3,252
Contingent consideration - acquisitions	855		1,407
Warrant settlement payable	1,025		—
Customer deposits	996		505
Other	3,263		5,251
Total other current liabilities	$	7,139	$	12,415

Other non-current liabilities

Other non-current liabilities is comprised of the following:



	December 31,
	2016		2015
Unrecognized tax benefits (including interest)	$	3,386	$	3,152
Contingent consideration - acquisitions	2,396		2,296
Deferred revenue	1,132		1,206
Other	2,088		2,900
Total non-current liabilities	$	9,002	$	9,554