The reconciliation of cash, cash equivalents and restricted cash reported on the unaudited condensed consolidated balance sheets to the total of the same such amounts in the unaudited condensed consolidated statements of cash flows is as follows (in thousands):


	September 30, 2022		December 31, 2021
Cash and cash equivalents	$	716,253	$	620,813
Restricted cash included in other assets	4,260		4,237
Total cash, cash equivalents and restricted cash	$	720,513	$	625,050


	September 30, 2022		December 31, 2021
Accounts receivable	$	660,108	$	521,597
Allowance for doubtful accounts	(215)		(132)
Product sales rebate and returns reserve	(8,381)		(4,956)
Accounts receivable, net	$	651,512	$	516,509


	September 30, 2022		December 31, 2021
Inventory deposits	$	121,916	$	46,311
Prepaid income taxes	1,409		8,977
Other current assets	142,627		163,916
Other prepaid expenses and deposits	33,593		18,531
Total prepaid expenses and other current assets	$	299,545	$	237,735


	September 30, 2022		December 31, 2021
Land	$	40,601	$	40,145
Equipment and machinery	119,379		90,915
Computer hardware and software	51,254		44,083
Leasehold improvements	30,060		30,502
Furniture and fixtures	3,573		3,634
Construction-in-process	1,997		2,378
Property and equipment, gross	246,864		211,657
Less: accumulated depreciation	(150,415)		(133,023)
Property and equipment, net	$	96,449	$	78,634

Depreciation expense was $6.9 million and $4.9 million for the three months ended September 30, 2022 and 2021, respectively, and $18.7 million and $14.6 million for the nine months ended September 30, 2022 and 2021, respectively.


	September 30, 2022		December 31, 2021
Accrued payroll related costs	$	82,791	$	99,571
Accrued manufacturing costs	103,098		80,213
Accrued product development costs	25,282		22,188
Accrued warranty costs	14,314		10,414
Other	15,124		14,257
Total accrued liabilities	$	240,609	$	226,643


	Nine Months Ended September 30,
	2022		2021
Warranty accrual, beginning of period	$	10,414	$	9,314
Liabilities accrued for warranties issued during the period	13,887		8,643
Warranty costs incurred during the period	(9,987)		(8,429)
Warranty accrual, end of period	$	14,314	$	9,528

The following table summarizes the beginning and ending balances of our contract assets included in "Prepaid and other current assets" on the condensed consolidated balance sheets (in thousands):

A contract liability is recognized when we have received customer payments in advance of our satisfaction of a performance obligation under a cancellable contract. The following table summarizes the activity related to our contract liabilities (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Contract liabilities, beginning balance	$	101,600	$	83,354	$	93,382	$	85,957
Less: Revenue recognized from beginning balance	(9,173)		(8,763)		(29,296)		(27,251)
Less: Beginning balance reclassified to deferred revenue	(9,898)		(3,996)		(2,998)		(2,443)
Add: Contract liabilities recognized	18,247		16,976		39,688		31,308
Contract liabilities, ending balance	$	100,776	$	87,571	$	100,776	$	87,571

As of September 30, 2022 and December 31, 2021, $42.2 million and $38.7 million of our contract liabilities, respectively, were included in "Other current liabilities" with the remaining balances included in "Other long-term liabilities" on the condensed consolidated balance sheets.

Deferred revenue is comprised mainly of unearned revenue related to multi-year post-contract support ("PCS") contracts, services and product deferrals related to acceptance clauses. The following table summarizes the activity related to our deferred revenue (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Deferred revenue, beginning balance	$	1,033,490	$	746,090	$	929,312	$	650,827
Less: Revenue recognized from beginning balance	(234,515)		(164,188)		(457,309)		(327,300)
Add: Deferral of revenue in current period, excluding amounts recognized during the period	142,069		218,538		469,041		476,913
Deferred revenue, ending balance	$	941,044	$	800,440	$	941,044	$	800,440

Other performance obligations include unbilled contract revenue for services and products that will be recognized in future periods. As of September 30, 2022, other performance obligations of $178.6 million were comprised mainly of unbilled multi-year PCS contract amounts that will be recognized as revenue in future periods. In addition, as of September 30, 2022 the company had entered into $844.2 million of binding contractual agreements with certain customers that are primarily related to future product shipments.

Revenue from total remaining performance obligations represents contract liabilities, deferred revenue and unbilled contract revenue that will be recognized in future periods. As of September 30, 2022, approximately $1,220.5 million of revenue is expected to be recognized from remaining performance obligations, of which approximately 82% is expected to be

recognized over the next two years and approximately 18% is expected to be recognized during the third to the fifth year. These amounts do not include the $844.2 million of binding contractual agreements related primarily to future product shipments outlined above. As of September 30, 2022, it is expected that the majority of the amounts allocated to these specific performance obligations will be recognized as revenue upon product shipment over the next two years; however, given the current uncertain supply chain environment and industry wide supply constraints, we may experience manufacturing and shipment delays or cancellations related to these performance obligations, which could impact revenue recognition.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Interest income	$	6,929	$	1,636	$	13,783	$	5,553
Unrealized gain on equity investments	708		—		24,121		—
Other income (expense), net	(820)		(290)		(140)		(913)
Total	$	6,817	$	1,346	$	37,764	$	4,640