Balance sheet components (Tables)

3 Months Ended

Mar. 31, 2020

Balance Sheet Related Disclosures [Abstract]

Schedule of accounts receivable, net

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

	March 31, 2020		December 31, 2019
Accounts receivable	$	61,914	$	68,988
Trade notes receivable	—		156
Allowance for doubtful accounts	(251)		(254)
	$	61,663	$	68,890

Schedule of inventories, net

Inventories consist of the following (in thousands): 

	March 31, 2020		December 31, 2019
Raw materials	$	21,987	$	19,350
Work in process	13,957		12,262
Finished goods(1)	10,202		15,318
	$	46,146	$	46,930

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(1)Finished goods inventory at customer vendor managed inventory locations was $1.5 million and $1.6 million as of March 31, 2020 and December 31, 2019, respectively.

Schedule of prepaid expenses and other current assets

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

	March 31, 2020		December 31, 2019
Transition services agreement receivable (refer to Note 6)	$	11,680	$	11,861
Prepaid taxes and taxes receivable	3,569		6,979
Deposits and other prepaid expenses	2,620		2,512
Other receivable	8,309		4,499
	$	26,178	$	25,851

Schedule of purchased intangible assets

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

	March 31, 2020						December 31, 2019
	Gross Assets		Accumulated Amortization		Net Assets		Gross Assets		Accumulated Amortization		Net Assets
Technology and patents	$	36,685	$	(35,537)	$	1,148	$	36,880	$	(35,555)	$	1,325
Customer relationships	15,004		(15,004)		—		15,089		(15,089)		—
Leasehold interest	1,201		(396)		805		1,222		(396)		826
	$	52,890	$	(50,937)	$	1,953	$	53,191	$	(51,040)	$	2,151

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 March 31,
	2020		2019
Cost of goods sold	$	184	$	184
Operating expenses	—		119
Total	$	184	$	303

Schedule of estimated future amortization expense of purchased intangible assets

The estimated future amortization expense of purchased intangible assets as of March 31, 2020, is as follows (in thousands): 

2020 (remaining nine months)	$	539
2021	644
2022	27
2023	27
2024	27
Thereafter	689
	$	1,953

Schedule of accrued and other current liabilities

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

	March 31, 2020		December 31, 2019
Employee-related	$	19,706	$	17,877
Transition services agreement payables (refer to Note 6)	11,759		11,765
Asset sale related warranty claims (refer to Note 6)	6,549		6,664
Operating lease liabilities, current	2,119		2,086
Income and other taxes payable	1,676		2,036
Accrued warranty	749		712
Other accrued expenses	6,152		6,341
	$	48,710	$	47,481

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 March 31,
	2020		2019
Beginning balance	$	712	$	672
Warranty accruals	225		315
Settlements	(188)		(248)
Ending balance	$	749	$	739

Schedule of other noncurrent liabilities

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

	March 31, 2020		December 31, 2019
Pension and other employee-related	$	3,958	$	4,125
Asset retirement obligations	3,756		3,529
Deferred income tax liabilities	1,733		528
Government grant	1,172		1,380
Other	51		52
	$	10,670	$	9,614