9. Supplementary Balance Sheet Information

The following tables provide the details of selected balance sheet items as of the dates indicated (in thousands):

Inventories

	December 31,
	2014		2013
Raw materials	$	38,934	$	34,749
Work-in-process		9,899		9,744
Finished goods		11,945		10,682
Demo and consigned inventory		2,165		3,115
Total inventories	$	62,943	$	58,290

Property, Plant and Equipment, net

	December 31,
	2014			2013
Cost:
Land, buildings and improvements	$	46,222		$	37,048
Machinery and equipment		50,487			48,107
Total cost		96,709			85,155
Accumulated depreciation		(56,621	)		(53,852	)
Property, plant and equipment, net	$	40,088		$	31,303

In 2014, the Company capitalized $10.4 million of assets which met the capital lease criteria of ASC 840-30, “Leases—Capital Lease”. The assets acquired under the capital lease are included in land, buildings and improvements and machinery and equipment and the related amortization expense is included in depreciation expense. The Company also capitalized software development costs of $0.2 million, $0.2 million and $0.6 million during the years ended 2014, 2013 and 2012, respectively, based on the guidance in ASC 350-40, “Internal-Use Software”. The following table summarizes depreciation expense on property, plant and equipment, including demo units and assets under capital leases (in thousands):

	Year Ended December 31,
	2014		2013		2012
Depreciation expense	$	8,016	$	7,400	$	6,868

The following table summarizes total accumulated depreciation on assets under capital leases as of the dates indicated (in thousands):

	December 31,
	2014		2013		2012
Accumulated depreciation on assets under capital leases	$	2,741	$	1,653	$	861

Accrued Expenses and Other Current Liabilities

The following table summarizes accrued expenses and other current liabilities as of the dates indicated (in thousands):

	December 31,
	2014		2013
Accrued compensation and benefits	$	7,741	$	8,624
Accrued warranty		3,044		3,315
Other		8,616		10,349
Total	$	19,401	$	22,288

Accrued Warranty

The following table summarizes accrued warranty activities for the periods indicated (in thousands):

	Year Ended December 31,
	2014			2013
Balance at beginning of year	$	3,315		$	2,204
Provision charged to cost of sales		1,684			1,891
Acquisition related warranty accrual		90			998
Use of provision		(2,003	)		(1,804	)
Foreign currency exchange rate changes		(42	)		26
Balance at end of year	$	3,044		$	3,315

Other Long Term Liabilities

The following table summarizes other long term liabilities as of the dates indicated (in thousands):

	December 31,
	2014		2013
Capital lease obligations	$	9,507	$	—
Accrued pension liabilities		6,037		2,322
Other		3,275		2,706
Total	$	18,819	$	5,028