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Balance Sheet Components | 12 Months Ended
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Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract] |
Balance Sheet Components | Balance Sheet Components Inventories consist of the following (in thousands):
|  | December 31,
|  | 2021 |  | 2020
Raw materials |  | $ | 123,234 |  |  | $ | 76,404 |
Work in progress |  | 51,706 |  |  | 31,393 |
Finished goods |  | 55,290 |  |  | 31,440 |
Total inventories |  | $ | 230,230 |  |  | $ | 139,237 |
Prepaid expenses and other current assets consist of the following (in thousands):
|  | December 31,
|  | 2021 |  | 2020
Prepaid expenses |  | $ | 70,218 |  |  | $ | 30,069 |
Other current assets |  | 125,087 |  |  | 61,685 |
Total prepaid expenses and other current assets |  | $ | 195,305 |  |  | $ | 91,754 |
Property, plant and equipment consist of the following (in thousands):
|  |  |  | December 31,
|  | Generally Used Estimated Useful Life |  | 2021 |  | 2020
Clinical and manufacturing equipment |  | Up to 10 years |  | $ | 452,876 |  |  | $ | 372,077 |
Building |  | 20 years |  | 310,344 |  |  | 244,166 |
Leasehold improvements |  | Lease term 1 |  | 61,289 |  |  | 63,541 |
Computer software and hardware |  | 3 years |  | 117,986 |  |  | 108,068 |
Land |  | — |  | 58,869 |  |  | 34,598 |
Furniture, fixtures and other |  | 2-5 years |  | 71,977 |  |  | 50,031 |
Construction in progress |  | — |  | 367,686 |  |  | 163,492 |
Total |  |  |  | 1,441,027 |  |  | 1,035,973 |
Less: Accumulated depreciation and impairment charges |  |  |  | (359,101) |  |  | (301,252) |
Total property, plant and equipment, net |  |  |  | $ | 1,081,926 |  |  | $ | 734,721 |
1 Shorter of the remaining lease term or the estimated useful lives of the assets Depreciation was $92.1 million, $80.1 million and $73.1 million for the year ended December 31, 2021, 2020 and 2019, respectively. Accrued liabilities consist of the following (in thousands):
|  | December 31,
|  | 2021 |  | 2020
Accrued payroll and benefits |  | $ | 288,355 |  |  | $ | 170,106 |
Accrued expenses |  | 67,169 |  |  | 42,536 |
Accrued property, plant and equipment |  | 46,561 |  |  | 27,692 |
Accrued sales and marketing expenses |  | 41,387 |  |  | 34,488 |
Accrued professional fees |  | 31,457 |  |  | 20,617 |
Accrued income taxes |  | 33,838 |  |  | 30,130 |
Current operating lease liabilities |  | 22,719 |  |  | 21,735 |
Other accrued liabilities |  | 75,829 |  |  | 58,278 |
Total accrued liabilities |  | $ | 607,315 |  |  | $ | 405,582 |
Accrued warranty as of December 31, 2021 and 2020, which is included in the “Other accrued liabilities” category of the accrued liabilities table above, consists of the following activity (in thousands):
Accrued warranty as of December 31, 2019 |  | $ | 11,205 |
Charged to cost of net revenues |  | 12,581 |
Actual warranty expenditures |  | (11,171) |
Accrued warranty as of December 31, 2020 |  | 12,615 |
Charged to cost of net revenues |  | 18,213 |
Actual warranty expenditures |  | (14,659) |
Accrued warranty as of December 31, 2021 |  | $ | 16,169 |
Deferred revenues consist of the following (in thousands):
|  | December 31,
|  | 2021 |  | 2020
Deferred revenues - current |  | $ | 1,152,870 |  |  | $ | 777,887 |
Deferred revenues - long-term 1 |  | 136,684 |  |  | 62,551 |
1 Included in Other long-term liabilities within our Consolidated Balance Sheet During the year ended December 31, 2021 and 2020, we recognized $3,952.6 million and $2,471.9 million of net revenues, respectively, of which $481.1 million and $341.9 million was included in the deferred revenues balance at December 31, 2020 and December 31, 2019, respectively.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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