Balance sheet components (Tables)

9 Months Ended

Sep. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of accounts receivable, net

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

	September 30, 2019			December 31, 2018
Accounts receivable	$	65,096		$	74,343
Trade notes receivable	400			672
Allowance for doubtful accounts	(251		)	(264		)
	$	65,245		$	74,751

Schedule of inventories, net

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

	September 30, 2019		December 31, 2018
Raw materials	$	23,316	$	27,806
Work in process	15,485		13,044
Finished goods(1)	9,867		11,309
	$	48,668	$	52,159

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(1)

Finished goods inventory at customer vendor managed inventory locations was $3.1 million and $5.6 million as of September 30, 2019 and December 31, 2018, respectively.

Schedule of prepaid expenses and other current assets

Prepaid expenses and other current assets consist of the following (in thousands):

	September 30, 2019		December 31, 2018
Prepaid taxes and taxes receivable	$	5,523	$	5,461
Transition services agreement receivable (refer to Note 6)	11,609		11,999
Deposits and other prepaid expenses	2,714		3,020
Other receivable	4,075		6,125
	$	23,921	$	26,605

Schedule of purchased intangible assets

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

	September 30, 2019							December 31, 2018
	Gross Assets		Accumulated Amortization			Net Assets		Gross Assets		Accumulated Amortization			Net Assets
Technology and patents	$	36,609	$	(35,107	)	$	1,502	$	37,029	$	(34,995	)	$	2,034
Customer relationships	14,970		(14,970		)	—		15,146		(15,026		)	120
Leasehold interest	1,193		(380		)	813		1,238		(374		)	864
	$	52,772	$	(50,457	)	$	2,315	$	53,413	$	(50,395	)	$	3,018

Schedule of 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 September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of goods sold	$	185	$	185	$	553	$	572
Operating expenses	—		118		119		357
Total	$	185	$	303	$	672	$	929

Schedule of estimated future amortization expense of purchased intangible assets

The estimated future amortization expense of purchased intangible assets as of September 30, 2019, is as follows (in thousands): 

2019 (remaining three months)	$	184
2020	736
2021	644
2022	27
2023	27
Thereafter	697
	$	2,315

Schedule of accrued and other current liabilities

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

	September 30, 2019		December 31, 2018
Transition services agreement payables (refer to Note 6)	$	11,757	$	11,769
Employee-related	14,111		14,899
Asset sale related contingent liabilities (refer to Note 6)	6,505		6,751
Operating lease liabilities, current	2,067		—
Accrued warranty	749		672
Deferred revenue, current	115		1,114
Income and other taxes payable	1,464		1,580
Rusnano payment derivative	—		2,000
Accrued litigation settlement	150		2,645
Other accrued expenses	5,496		8,858
	$	42,414	$	50,288

Schedule of 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 September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Beginning balance	$	751		$	1,592		$	672		$	1,334
Warranty accruals	198			(42		)	674			487
Settlements	(200		)	(351		)	(597		)	(622		)
Ending balance	$	749		$	1,199		$	749		$	1,199

Schedule of other noncurrent liabilities

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

	September 30, 2019		December 31, 2018
Pension and other employee-related	$	4,121	$	4,529
Deferred rent	—		3,058
Government grant	2,075		2,108
Capital lease obligation	—		282
Asset retirement obligations and other	3,552		3,522
	$	9,748	$	13,499