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Balance Sheet Components
3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Components
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, 2021December 31, 2020
Raw materials$58,816 $45,341 
Work in process20,853 22,099 
Finished goods165,652 152,087 
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, 2021December 31, 2020
Payroll and employee-related cost$57,234 $50,083 
Accrued expenses13,213 9,246 
Sales return provision1,470 9,812 
Product warranty3,314 2,896 
Other acquisition-related costs(1)
3,000 3,000 
Other accrued liabilities11,983 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, 2021December 31, 2020
Balance at the beginning of the period$2,896 $2,318 
Accruals of warranties issued775 1,589 
Settlements of warranty claims(357)(1,011)
Balance at the end of the period$3,314 $2,896