Balance Sheet Details:

Inventories

Inventories are comprised of the following:



	December 31,
	2012		2013
Materials	$	29,746	$	31,194
Work-in-process	12,298		19,867
Finished goods	15,904		10,290
Total inventories	$	57,948	$	61,351

The Company has established reserves of $5,620 and $6,101 at December 31, 2012 and 2013, respectively, for slow moving and obsolete inventory. During 2012, the Company recorded a net charge in cost of revenues of $2,934 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 2012, the Company disposed of $5,241 of inventory. During 2013, the Company recorded a net charge in cost of revenues of $2,863 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 2013, the Company disposed of $2,382 of inventory.

Property, Plant and Equipment

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



	December 31,
	2012			2013
Land and building	$	4,997		$	5,024
Machinery and equipment	18,826			20,827
Furniture and fixtures	3,381			4,043
Computer equipment	7,789			5,568
Leasehold improvements	6,807			7,744
	41,800			43,206
Accumulated depreciation	(29,891		)	(30,148		)
Total property, plant and equipment, net	$	11,909		$	13,058

Depreciation expense amounted to $4,210, $3,680 and $4,150 for the years ended December 31, 2011, 2012, and 2013, respectively.

Other current liabilities

Other current liabilities is comprised of the following:



	December 31,
	2012		2013
Litigation accrual	$	4,293	$	4,293
Other	4,066		5,839
Total other current liabilities	$	8,359	$	10,132

Other non-current liabilities

Other non-current liabilities is comprised of the following:



	December 31,
	2012		2013
Unrecognized tax benefits (including interest)	$	5,871	$	2,806
Contingent consideration - acquisitions	—		4,340
Other	2,166		1,772
Total non-current liabilities	$	8,037	$	8,918