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Balance Sheet Components
 3 Months Ended
Mar. 31, 2022
Notes To Financial Statements [Abstract]  
Balance Sheet Components Balance Sheet Components
Inventories consist of the following (in thousands):
March 31,
2022		December 31,
2021
Raw materials$133,808 $123,234 
Work in process79,495 51,706 
Finished goods62,366 55,290 
Total inventories$275,669 $230,230 

Prepaid expenses and other current assets consist of the following (in thousands):
March 31,
2022		December 31,
2021
Value added tax receivables$134,941 $93,610 
Prepaid expenses74,069 70,218 
Other current assets32,329 31,477 
Total prepaid expenses and other current assets$241,339 $195,305 

Accrued liabilities consist of the following (in thousands): 
March 31,
2022		December 31,
2021
Accrued payroll and benefits$156,272 $288,355 
Accrued expenses66,211 67,169 
Accrued income taxes45,646 33,838 
Accrued sales and marketing expenses41,221 41,387 
Accrued professional fees36,340 31,457 
Accrued property, plant and equipment25,296 46,561 
Current operating lease liabilities25,243 22,719 
Other accrued liabilities68,842 75,829 
Total accrued liabilities$465,071 $607,315 

Accrued warranty, which is included in the "Other accrued liabilities" category of the accrued liabilities table above, consists of the following activity (in thousands):
Three Months Ended
March 31,
 20222021
Balance at beginning of period$16,169 $12,615 
Charged to cost of net revenues3,536 4,280 
Actual warranty expenditures(3,612)(3,160)
Balance at end of period$16,093 $13,735 

Deferred revenues consist of the following (in thousands):
March 31,
2022		December 31,
2021
Deferred revenues - current$1,212,067 $1,152,870 
Deferred revenues - long-term 1
$146,998 $136,684 

1 Included in Other long-term liabilities within our Condensed Consolidated Balance Sheet

During the three months ended March 31, 2022 and 2021, we recognized $973.2 million and $894.8 million of net revenues, respectively, of which $184.9 million and $125.8 million was included in the deferred revenues balance at December 31, 2021 and 2020, respectively.
Our unfulfilled performance obligations, including deferred revenues and backlog, as of March 31, 2022 were $1,385.4 million. These performance obligations are expected to be fulfilled over six months to five years.