Balance sheet components (Tables)

9 Months Ended

Sep. 30, 2015

Balance Sheet Components [Abstract]

Restricted Cash and Investments

Restricted cash and investments consist of the following (See Note 8) (in thousands):

	September 30, 2015		December 31, 2014
Restricted in connection with notes payable	$	3,062	$	3,754
Restricted in connection with Comerica Bank term loan		—		17,500
Total restricted cash and investments	$	3,062	$	21,254
Reported as:
Restricted cash and investments	$	3,062	$	5,504
Restricted cash and investments, non-current		—		15,750
Total restricted cash and investments	$	3,062	$	21,254

Accounts Receivable, Net

Accounts receivable, net consists of the following (in thousands):

	September 30, 2015		December 31, 2014
Accounts receivable	$	74,672	$	69,839
Trade notes receivable		4,146		7,999
Allowance for doubtful accounts		(988)		(241)
	$	77,830	$	77,597

Inventories, net

Inventories, net consist of the following (in thousands):

	September 30, 2015		December 31, 2014
Raw materials	$	29,487	$	23,804
Work in process		13,866		13,600
Finished goods		27,394		19,943
	$	70,747	$	57,347

(1)Finished goods inventory at customer vendor managed inventory locations was $13.7 million and $6.4 million as of September 30, 2015 and December 31, 2014, respectively.

Purchased Intangible Assets

Purchased intangible assets consist of the following (in thousands):

	September 30, 2015						December 31, 2014
	Gross		Accumulated		Net		Gross		Accumulated		Net
	Assets		Amortization		Assets		Assets		Amortization		Assets
Technology and patents	$	37,685	$	(30,474)	$	7,211	$	34,023	$	(28,402)	$	5,621
Customer relationships		15,226		(12,300)		2,926		14,725		(11,176)		3,549
Leasehold interest		1,338		(306)		1,032		1,386		(293)		1,093
Non-compete agreements		862		(862)		—		862		(862)		—
	$	55,111	$	(43,942)	$	11,169	$	50,996	$	(40,733)	$	10,263

Amortization Expense of Purchased Intangible Assets

The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the condensed consolidated statements of operations (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Cost of goods sold	$	836	$	709	$	2,512	$	2,137
Operating expenses		447		378		1,344		1,136
Total	$	1,283	$	1,087	$	3,856	$	3,273

Estimated Future Amortization Expense of Purchased Intangible Assets

The estimated future amortization expense of purchased intangible assets as of September 30, 2015, is as follows (in thousands):

2015 (remaining three months)	$	1,287
2016		4,463
2017		1,327
2018		1,149
2019		794
Thereafter		2,149
	$	11,169

Accrued Expenses and Other Current Liabilities

Accrued and other current liabilities consist of the following (in thousands):

	September 30, 2015		December 31, 2014
Employee-related	$	13,519	$	13,635
Accrued warranty		1,160		1,751
Penalty payment derivative		389		530
Deferred income tax liabilities		181		181
Other accrued expenses		6,157		6,631
	$	21,406	$	22,728

Summary of Movement in Warranty Accrual

The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Beginning balance	$	1,254	$	1,811	$	1,751	$	1,737
Warranty accruals		90		100		(85)		631
Settlements		(184)		(89)		(506)		(546)
Ending balance	$	1,160	$	1,822	$	1,160	$	1,822

Other Noncurrent Liabilities

Other noncurrent liabilities consist of the following (in thousands):

	September 30, 2015		December 31, 2014
Pension and other employee-related	$	5,362	$	5,355
Other		2,185		1,871
	$	7,547	$	7,226