Balance Sheet Components

9 Months Ended

Sep. 30, 2020

Notes To Financial Statements [Abstract]

Balance Sheet Components

Balance Sheet Components

Inventories consist of the following (in thousands): 

	September 30, 2020		December 31, 2019
Raw materials	$	70,659	$	54,947
Work in process	26,167		30,974
Finished goods	26,267		26,130
Total inventories	$	123,093	$	112,051

Prepaid expenses and other current assets consist of the following (in thousands): 

	September 30, 2020		December 31, 2019
Tax related receivables	$	55,162	$	41,252
Current promissory note and related interest receivable 1	14,552		25,005
Prepaid software and maintenance	13,598		7,128
Others	25,264		29,065
Total prepaid expenses and other current assets	$	108,576	$	102,450

1Refer to Note 6“Equity Method Investments” of the Notes to Condensed Consolidated Financial Statements for more information.

Accrued liabilities consist of the following (in thousands): 

	September 30, 2020		December 31, 2019
Accrued payroll and benefits	$	126,112	$	162,486
Accrued expenses	63,117		55,529
Accrued property, plant and equipment	25,597		9,167
Current operating lease liabilities	20,674		15,737
Accrued professional fees	19,112		10,410
Accrued income taxes	15,539		14,130
Others	48,320		52,499
Total accrued liabilities	$	318,471	$	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. We also warrant our CAD/CAM software for a one year period to perform in accordance with agreed product specifications. As we have not historically incurred any material warranty costs, we do not accrue for these software warranties. Warranty accrual consists of the following activity (in thousands):

	Nine Months Ended September 30,
	2020		2019
Balance at beginning of period	$	11,205	$	8,551
Charged to cost of net revenues	8,047		9,429
Actual warranty expenditures	(8,229)		(7,178)
Balance at end of period	$	11,023	$	10,802

Deferred revenues consist of the following (in thousands):

	September 30, 2020		December 31, 2019
Deferred revenues - current	$	684,139	$	563,762
Deferred revenues - long-term 1	$	46,986	$	35,503

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

During the three months ended September 30, 2020 and 2019, we recognized $734.1 million and $607.3 million of revenue, respectively, of which $99.6 million and $70.1 million was included in the deferred revenues balance at December 31, 2019 and 2018, respectively.

During the nine months ended September 30, 2020 and 2019, we recognized $1.6 billion and $1.8 billion of revenue, respectively, of which $263.3 million and $207.0 million was included in the deferred revenues balance at December 31, 2019 and 2018, respectively.

Our unfulfilled performance obligations, including deferred revenues and backlog, as of September 30, 2020 were $744.7 million. These performance obligations are expected to be recognized over the next one to five years.