Balance sheet components

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Balance sheet components

Balance sheet components 

Accounts receivable, net

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

	March 31, 2021		December 31, 2020
Accounts receivable	$	40,020	$	45,277
Allowance for doubtful accounts	(45)		(45)
	$	39,975	$	45,232

Inventories

Inventories consist of the following (in thousands): 

	March 31, 2021		December 31, 2020
Raw materials	$	24,741	$	25,620
Work in process	10,348		9,196
Finished goods(1)	11,284		12,085
	$	46,373	$	46,901

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(1)Finished goods inventory at customer vendor managed inventory locations was $1.4 million and $1.7 million as of March 31, 2021 and December 31, 2020, respectively.

Prepaid expenses and other current assets

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

	March 31, 2021		December 31, 2020
Transition services agreement receivable (refer to Note 11)	$	—	$	5,933
Prepaid taxes and taxes receivable	6,008		6,137
Receivables due from suppliers	6,056		4,891
Deposits and other prepaid expenses	2,983		2,417
Other receivable	378		795
	$	15,425	$	20,173

Purchased intangible assets, net 

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

	March 31, 2021						December 31, 2020
	Gross Assets		Accumulated Amortization		Net Assets		Gross Assets		Accumulated Amortization		Net Assets
Technology and patents	$	37,593	$	(37,154)	$	439	$	37,637	$	(37,021)	$	616
Customer relationships	15,399		(15,399)		—		15,487		(15,487)		—
Leasehold interest	1,299		(458)		841		1,304		(452)		852
	$	54,291	$	(53,011)	$	1,280	$	54,428	$	(52,960)	$	1,468

For the three months ended March 31, 2021 and 2020, amortization expense relating to technology and patents is included within cost of goods sold and totaled $0.2 million in each period.

The estimated future amortization expense of purchased intangible assets as of March 31, 2021, was as follows (in thousands): 

2021 (remaining nine months)	$	446
2022	10
2023	10
2024	10
2025	10
Thereafter	794
	$	1,280

Accrued and other current liabilities

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

	March 31, 2021		December 31, 2020
Employee-related	$	22,663	$	19,656
Transition services agreement payables (refer to Note 11)	823		9,708
Operating lease liabilities, current	2,143		2,128
Income and other taxes payable	1,289		1,590
Accrued warranty	1,096		1,111
Other accrued expenses	4,658		7,860
	$	32,672	$	42,053

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,
	2021		2020
Beginning balance	$	1,111	$	712
Warranty accruals	61		225
Settlements	(76)		(188)
Ending balance	$	1,096	$	749

 Other noncurrent liabilities 

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

	March 31, 2021		December 31, 2020
Pension and other employee-related	$	3,671	$	3,844
Asset retirement obligations	3,825		3,810
Transition services agreement payables (See Note 11)	—		823
Deferred income tax liabilities	500		501
Government grant	584		606
	$	8,580	$	9,584