Supplementary Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2012

Inventories

Inventories

	December 31,
	2012		2011
Raw materials	$	30,554	$	30,406
Work-in-process		11,959		12,943
Finished goods		8,023		6,563
Demo and consigned inventory		2,265		1,627
Total inventories	$	52,801	$	51,539

Property, Plant and Equipment, net

Property, Plant and Equipment, net

	December 31,
	2012			2011
Cost:
Land, buildings and improvements	$	38,955		$	37,206
Machinery and equipment		45,821			45,221
Total cost		84,776			82,427
Accumulated depreciation		(52,438	)		(46,472	)
Property, plant and equipment, net	$	32,338		$	35,955

Summary of Depreciation Expense on Property, Plant and Equipment, Including Amortization of Demo Units and Capital Lease

The following table summarizes depreciation expense on property, plant and equipment, including amortization of demo units and the capital lease (in thousands):

	Year Ended December 31,
	2012		2011		2010
Depreciation expense	$	9,612	$	7,100	$	6,393

Summary of Total Accumulated Amortization on Capital Leases

The following table summarizes total accumulated amortization on capital leases as of the periods indicated (in thousands):

	December 31,
	2012		2011
Accumulated amortization on capital lease	$	861	$	123

Accrued Expenses and Other Current Liabilities

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

	December 31,
	2012		2011
Accrued compensation and benefits	$	6,655	$	7,512
Accrued warranty		2,777		3,035
Customer deposits		3,033		380
Other		6,497		8,000
Total accrued expenses and other current liabilities	$	18,962	$	18,927

Accrued Warranty

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

	December 31,
	2012			2011
Balance at beginning of the year	$	3,035		$	3,174
Provision charged to cost of goods sold		2,463			2,440
Use of provision		(2,781	)		(2,579	)
Foreign currency exchange rate changes		60			—
Balance at end of year	$	2,777		$	3,035