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Balance Sheet Components

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

4. Balance Sheet Components

Inventories

The following table shows the components of inventories as of March 31, 2021 and December 31, 2020 (in thousands):


	March 31, 2021		December 31, 2020
Raw materials	$	58,816	$	45,341
Work in process	20,853		22,099
Finished goods	165,652		152,087
Inventories	$	245,321	$	219,527

Accrued Liabilities

The following table shows the components of accrued liabilities as of March 31, 2021 and December 31, 2020 (in thousands):


	March 31, 2021		December 31, 2020
Payroll and employee-related cost	$	57,234	$	50,083
Accrued expenses	13,213		9,246
Sales return provision	1,470		9,812



Product warranty	3,314		2,896



Other acquisition-related costs(1)	3,000		3,000
Other accrued liabilities	11,983		10,758
Total accrued liabilities	$	90,214	$	85,795

(1) Amount consists of a contingent liability related to an anti-dilution provision from the asset acquisition of MVI Health Inc. (“MVI”) in 2018.

The following table shows the changes in the Company’s estimated product warranty accrual, included in accrued liabilities, as of March 31, 2021 and December 31, 2020 (in thousands):


	March 31, 2021		December 31, 2020
Balance at the beginning of the period	$	2,896	$	2,318
Accruals of warranties issued	775		1,589
Settlements of warranty claims	(357)		(1,011)
Balance at the end of the period	$	3,314	$	2,896