Balance sheet components

3 Months Ended

Mar. 31, 2022

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, 2022		December 31, 2021
Accounts receivable	$	63,838	$	55,324
Allowance for doubtful accounts	—		—
	$	63,838	$	55,324

Inventories

Inventories consist of the following (in thousands):

	March 31, 2022		December 31, 2021
Raw materials	$	37,453	$	32,809
Work in process	17,675		14,851
Finished goods(1)	4,609		5,236
	$	59,737	$	52,896

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(1)Finished goods inventory at customer vendor managed inventory locations was $1.8 million and $1.8 million as of March 31, 2022 and December 31, 2021, respectively.

Prepaid expenses and other current assets

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

	March 31, 2022		December 31, 2021
Prepaid taxes and taxes receivable	$	7,330	$	5,825
Receivables due from suppliers	8,556		6,728
Deposits and other prepaid expenses	3,167		2,682
Other receivable	969		1,011
	$	20,022	$	16,246

Purchased intangible assets, net 

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

	March 31, 2022						December 31, 2021
	Gross Assets		Accumulated Amortization		Net Assets		Gross Assets		Accumulated Amortization		Net Assets
Technology and patents	$	37,850	$	(37,850)	$	—	$	37,814	$	(37,814)	$	—
Customer relationships	15,502		(15,502)		—		15,535		(15,535)		—
Leasehold interest	1,342		(503)		839		1,339		(495)		844
	$	54,694	$	(53,855)	$	839	$	54,688	$	(53,844)	$	844

For the three months ended March 31, 2022 and 2021, amortization expense relating to technology and patents is included within cost of goods sold and totaled $0.0 million and $0.2 million in each period, respectively.

The estimated future amortization expense of purchased intangible assets as of March 31, 2022, was as follows (in thousands): 

2022 (remaining nine months)	$	23
2023	30
2024	30
2025	30
2026	30
Thereafter	696
	$	839

Accrued and other current liabilities

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

	March 31, 2022		December 31, 2021
Employee-related	$	16,413	$	14,956
Transition services agreement payable (refer to Note 11)	—		823
Operating lease liabilities, current	2,443		2,356
Income and other taxes payable	2,814		2,703
Accrued warranty	966		977
Other accrued expenses	10,712		8,193
	$	33,348	$	30,008

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,
	2022		2021
Beginning balance	$	977	$	1,111
Warranty accruals	64		61
Settlements	(75)		(76)
Ending balance	$	966	$	1,096

Other noncurrent liabilities 

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

 

	March 31, 2022		December 31, 2021
Pension and other employee-related	$	3,049	$	3,266
Asset retirement obligations	3,524		3,508
Government grant	695		369
Other	215		294
	$	7,483	$	7,437