Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Change in Allowance for Doubtful Accounts

The following table summarizes the change in our allowance for doubtful accounts for the three months ended March 31, 2015 and 2014:

	2015			2014
	(in thousands)
Beginning balance	$	671		$	495
Reversal of expense		(26	)		—
Charge-offs		—			—
Ending balance	$	645		$	495

Components of Inventories

Components of inventories are as follows:

	March 31, 2015		December 31, 2014
	(in thousands)
Raw material	$	28,773	$	28,688
Work-in-process		10,032		10,240
Finished goods		13,551		15,118
	$	52,356	$	54,046

Summary of Property, Plant and Equipment, Net

Property, plant and equipment, net consists of the following:

	Estimated Useful Lives	March 31, 2015			December 31, 2014
		(in thousands)
Machinery and equipment	1.5 to 7 years	$	20,504		$	21,279
Leasehold improvements	3 to 10 years		8,917			9,070
Office equipment, furniture and fixtures	5 to 7 years		2,014			2,206
Purchased software	1 to 7 years		6,694			6,474
			38,129			39,029
Less: accumulated depreciation			(21,109	)		(19,993	)
		$	17,020		$	19,036

Summary of Other Accrued Liabilities

Other accrued liabilities consist of the following:

	March 31, 2015		December 31, 2014
	(in thousands)
Accrued payroll and other employee costs	$	9,578	$	13,404
Accrued material purchases		4,251		4,284
Accrued warranty		4,815		4,685
Accrued research and development costs		2,772		2,663
Other accrued expenses		12,255		11,553
	$	33,671	$	36,589

Summary of Changes in Warranty Liability

The following table summarizes the change in our warranty liability for the three months ended March 31, 2015 and 2014:

	2015			2014
	(in thousands)
Beginning balance	$	4,685		$	2,498
Accrual for warranty expense		785			2,105
Warranty costs incurred during the period		(655	)		(341	)
Ending balance	$	4,815		$	4,262

Summary of Changes in Product Recall Liability

The following table summarizes the change in product recall liability for the three months ended March 31, 2015:

	2015
	(in thousands)
Beginning balance	$	1,888
Accrual for recall costs		505
Recall costs incurred during the period		(1,305	)
Ending balance	$	1,088

Summary of Changes in Accrued Restructuring Costs

The following table summarizes changes in our accrued restructuring costs for the three months ended March 31, 2015:

	Facility Leases			Severance and Related			Contract Termination		Total
	(in thousands)
Beginning balance	$	1,266		$	—		$	—	$	1,266
Restructuring charges		139			598			310		1,047
Payments		(191	)		(217	)		—		(408	)
Adjustments to estimated obligations		456			—			—		456
Change in fair value		11			—			—		11
Ending balance	$	1,681		$	381		$	310	$	2,372