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Balance Sheet Components | 3 Months Ended
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Mar. 31, 2020
Notes To Financial Statements [Abstract] |
Balance Sheet Components | Balance Sheet Components Inventories consist of the following (in thousands):
|  | March 31, 2020 |  | December 31, 2019
Raw materials |  | $ | 59,136 |  |  | $ | 54,947 |
Work in process |  | 35,627 |  |  | 30,974 |
Finished goods |  | 26,214 |  |  | 26,130 |
Total inventories |  | $ | 120,977 |  |  | $ | 112,051 |
Prepaid expenses and other current assets consist of the following (in thousands):
|  | March 31, 2020 |  | December 31, 2019
Tax related receivables |  | $ | 50,866 |  |  | $ | 41,252 |
Prepaid software and maintenance |  | 29,182 |  |  | 7,128 |
Current promissory note 1 |  | 27,914 |  |  | 25,005 |
Other prepaid expenses and current assets |  | 19,624 |  |  | 24,637 |
Other current receivables |  | 4,262 |  |  | 4,428 |
Total prepaid expenses and other current assets |  | $ | 131,848 |  |  | $ | 102,450 |
1Refer to Note 4“Equity Method Investments” of the Notes to Condensed Consolidated Financial Statements for more information. Accrued liabilities consist of the following (in thousands):
|  | March 31, 2020 |  | December 31, 2019
Accrued payroll and benefits |  | $ | 87,526 |  |  | $ | 162,486 |
Accrued expenses |  | 50,669 |  |  | 55,529 |
Current operating lease liabilities |  | 20,225 |  |  | 15,737 |
Accrued fixed assets |  | 18,781 |  |  | 9,167 |
Accrued income taxes |  | 15,324 |  |  | 14,130 |
Accrued professional fees |  | 12,738 |  |  | 10,410 |
Others |  | 54,196 |  |  | 52,499 |
Total accrued liabilities |  | $ | 259,459 |  |  | $ | 319,958 |
We regularly review the balance for accrued warranty and update based on historical warranty trends. Actual warranty costs incurred have not materially differed from those accrued; however, future actual warranty costs could differ from the estimated amounts. Warranty accrual consists of the following activity (in thousands):
|  | Three Months Ended March 31, |  |
|  | 2020 |  | 2019
Balance at beginning of period |  | $ | 11,205 |  |  | $ | 8,551 |
Charged to cost of net revenues |  | 3,724 |  |  | 3,133 |
Actual warranty expenditures |  | (3,140) |  |  | (1,451) |
Balance at end of period |  | $ | 11,789 |  |  | $ | 10,233 |
Deferred revenues consist of the following (in thousands):
|  | March 31, 2020 |  | December 31, 2019
Deferred revenues - current |  | $ | 578,537 |  |  | $ | 563,762 |
Deferred revenues - long-term 1 |  | $ | 36,628 |  |  | $ | 35,503 |
1 Included in other long-term liabilities within our Condensed Consolidated Balance Sheet During the three months ended March 31, 2020 and 2019, we recognized $551.0 million and $549.0 million of revenue, respectively, of which $95.5 million a nd $68.4 million was included in the deferred revenues balance at December 31, 2019 and 2018, respectively. Our unfilled performance obligations, including deferred revenues and backlog, as of March 31, 2020 were $619.7 million. These performance obligations are expected to be recognized over the next one to five years.

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- Definition Notes to Financial Statements [Abstract] + References No definition available. + Details
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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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